2. Background

The traditional notion of the category of roots holds that they are inherently specified for category (dog is a noun; run is a verb). This is discussed in Chomsky (Reference Chomsky, Jacobs and Rosenbaum1970) and formalized in Chomsky and Lasnik (Reference Chomsky and Lasnik1977: 430), but of course is found in traditional grammars throughout history going back, as mentioned, to at least Pāṇini. Chomsky and Lasnik proposed bivalent categorial features as in (1).

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   1. a. Noun: [+N, −V]

   2. b. Verb: [−N, +V]

   3. c. Adj: [+N, −V]

   4. d. Preposition: [−N, −V]

Many traditional grammatical descriptions and analyses still assume that roots are always categorially specified.

A well-known competing hypothesis for the nature of roots is to assume that all roots are categorially unspecified (Borer Reference Borer1984, Reference Borer2005; Marantz Reference Marantz1997; Panagiotidis Reference Panagiotidis2011). For convenience we refer to this as the Bare Roots Hypothesis. Support for this hypothesis comes from the observation that the same root can be a noun, verb or adjective in many cases: The car is red. I like the colour red. John reddened the icing. Note that in this case an affix appears on the verb redden, but the point is that the lexical root contained inside this verb is a category neutral root. Categorizers are typically identified as v, n, and a.

The final hypothesis we investigate has not gained as much widespread recogni- tion, so we describe it in more detail here. In this proposal, all roots are nouns (Kayne Reference Kayne2009). For convenience we refer to this as the Roots as Nouns Hypothesis. Verbs, then, are typically derived from a nominal root plus a verbalizer; however, Kayne proposes that a large number of verbs are likely functional heads. Under Kayne's proposal, the nominal root undergoes self-Merge forming a phrase.Footnote ² This NP can then participate in the formation of a DP, or it can merge with a light verb to form what is normally perceived as a verb (possibly by conflation in the sense of Hale and Keyser Reference Hale and Keyser2002). These two possibilities are illustrated here. Note, though, that while Kayne suggests that verbs are either light verbs or involve conflation, he does not give a full account of how verbs are formed. The structures below are an extrapolation of his discussion.Footnote ³

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Northern Iroquoian languages are spoken in east-central North America on the border between Canada and the US. Northern Iroquoian languages are highly polysynthetic and exhibit noun incorporation (Lounsbury Reference Lounsbury1949, Reference Lounsbury1953; Mithun Reference Mithun, Campbell and Mithun1979; Baker Reference Baker1996; Abbott Reference Abbott2000; Barrie Reference Barrie2015; Michelson Reference Michelson2016; Michelson et al. Reference Michelson, Kennedy and Doxtator2016; Woodbury Reference Woodbury2018). Extant Northern Iroquoian languages include Onondaga, Oneida, Cayuga, Seneca, Mohawk and Tuscarora. Examples will be drawn from the first four of these.

The Iroquoian family has two branches: Southern Iroquoian (spoken in Oklahoma and North Carolina), and Northern Iroquoian (spoken in Ontario, New York State and Minnesota). This article deals only with Northern Iroquoian languages. Northern Iroquoian languages are highly polysynthetic and exhibit complex agreement with both the subject and the object (Lounsbury Reference Lounsbury1949, Baker Reference Baker1985). We present the classification of the extant Iroquoian languages here (Julian Reference Julian2010). The names of the languages are given in italics.

In the next section, we describe aspects of verbal and nominal structure as well as noun incorporation in Northern Iroquoian.

3. Properties of lexical categories in Northern Iroquoian

This section discusses the relevant properties of nominal and verbal structure in Northern Iroquoian (Lounsbury Reference Lounsbury1949, Reference Lounsbury1953) as well as the basic properties of noun incorporation (Woodbury Reference Woodbury1975a,Reference Woodburyb). We discuss in detail the asymmetry described in the introduction, concentrating on the requirement for a nominalizer with various kinds of roots. First, however, we provide some background on Northern Iroquoian.

Traditionally, roots in Northern Iroquoian languages are described as either nom- inal or verbal. Nominal roots appear in nouns and can be incorporated as described in the previous section. Verbal roots require a nominalizer in order to be used as nouns or to undergo noun incorporation. In the following discussion we refer to the overt nominalizer in Northern Iroquoian as the “overt nlzr”, to match the interlinear gloss. When needed, a hypothetical null nominalizer will be referred to as “null n”. A generic term for any nominalizer will simply be n. As mentioned in the introduction, there are three kinds of roots that can be described with respect to the use of the nominalizer. Traditional nouns never require a nominalizer for NI or for forming a full DP. Traditional verbs typically do require a nominalizer both for NI and for forming a full DP. What is not much discussed is the third kind of roots mentioned, in which the nominalizer is required for NI only. We commence with a basic description of nominal and verbal structure, then present several examples of these three types of roots. Hereafter, we use the term “traditional noun root” and “traditional verb root” to refer to the traditional notions of these two concepts as described in the Iroquoianist literature.

3.1 Nominal structure

Regular full nominals in Northern Iroquoian typically consist of a lexical root, a nominal prefix and a nominal suffix. Consider the Onondaga examples in (3).Footnote ⁴

The suffix (nfs) is often arbitrary or reduced to a single form. In Onondaga, how- ever, it typically indicates the noun class: human or non-human (Woodbury Reference Woodbury2003). The noun prefix (npref) is also typically arbitrary. In Onondaga non-human nouns it indicates noun class (natural or man-made, with some exceptions). In Seneca one prefix is historically older, so more newly coined words tend to have the newer prefix. One can easily see the link between more newly coined words and man-made items, but whether there is a connection between these two properties in Onondaga and Seneca, respectively, requires further investigation. As the structure of nouns is well established and has been illustrated in numerous previous sources, we have given just two examples here.

Next, what are traditionally described as verbal roots (in an ontological sense) are nominalized with an overt nominalizer. In the Cayuga example shown in (4), the nominalizer appears between the root and the noun forming suffix. Again, this has been amply illustrated in the literature.

3.2 Verbal structure

As in many polysynthetic languages, the verbal structure of Northern Iroquoian languages can be complex. Traditional descriptions of the verbal complex can be found in Lounsbury (Reference Lounsbury1949, Reference Lounsbury1953), Mithun and Henry (Reference Mithun and Henry1984), Abbott (Reference Abbott2000), Barrie (Reference Barrie2015), Michelson et al. (Reference Michelson, Kennedy and Doxtator2016), Woodbury (Reference Woodbury2018), as well as the dictionaries referenced throughout this article. All verbs require a pronominal prefix indicating the core discourse participants, a verb root, and an aspectual suffix, as illustrated in the Onondaga example in (5). In addition to the agreement prefix and the aspectual suffix, this form also contains a factual mood prefix.

3.3 Noun incorporation

Northern Iroquoian is well-known for noun incorporation (Woodbury Reference Woodbury1975a,Reference Woodburyb; Mithun Reference Mithun1984; Baker Reference Baker1988). While the details of noun incorporation differ from one language to the next (Barrie and Mathieu Reference Barrie and Mathieu2016), in Northern Iroquoian, noun incorporation is typically formed by the incorporation of a nominal root into the verbal complex. The nominal prefix and suffix just described are absent. A typical example from Onondaga is given in (6); note that the orthography has been updated to conform to standard Iroquoianist practice.

3.4 Three kinds of roots

As mentioned in the introduction, there are three kinds of roots with respect to DP structure and noun incorporation: (i) roots such as tobacco, which require a nominalizer neither for NI nor for forming a full DP, (ii) roots such as write, which require a nominalizer both for NI and to form a full DP, and (iii) roots such as friend, which require a nominalizer for NI only. What is absent is the fourth logical possibility – roots that require a nominalizer to form a full DP, but not for NI. We discuss these three kinds of roots in turn. As this section provides the core empirical basis for our discussion, we provide numerous examples, especially of the third type.

3.4.1 Roots that never require a nominalizer

An example of a root that never requires a nominalizer was given in (6). In the dis- cussions below, these will often be referred to as tobacco-type roots. They typically correspond to traditional noun roots. Some additional examples from other Northern Iroquoian languages are given in (7) and (8).

3.4.2 Roots that require a nominalizer for both NI and DP

When a verbal root is used to form a DP or is incorporated, it typically appears with a nominalizer (Woodbury Reference Woodbury2003, Dyck et al. Reference Dyck, Froman, Keye and Keye2014), as shown in (9) and (10). In the discussion below, these examples are often referred to as write-type roots. These roots typically correspond to traditional verbs.

3.4.3 Roots that require the nominalizer for NI only

There are a handful of roots with which the nominalizer is required only when it is incorporated and not when it appears in a full DP. Consider the Onondaga exam- ples in (11) and (12). In the second of these examples, the root is a borrowing. In this particular example, the fact that the root is borrowed does not affect the rest of the morphological structure. Unlike some loan words which have not been fully integrated into the language (such as kháfe ‘coffee’), the borrowed form for ‘soldier’ has been fully integrated into Onondaga. Note the significant difference in the phonological form (as compared to similarity of the borrowed form for ‘coffee’). Most importantly, the borrowed root hsota:ho ‘soldier’ requires the same nominal morphology that native roots require, whereas khófe ‘coffee’ remains bare. In other words, fully integrated roots like hsota:ho ‘soldier’ exhibit the same properties as native roots, but more recently borrowed roots behave slightly differently, and, unsurprisingly, do not have the same properties as native roots or fully integrated borrowed roots. We leave the more recently borrowed roots for future research.Footnote ⁵

In the Cayuga example in (13b), the derived verbal form has been re-nominalized. Nevertheless, to initially undergo noun incorporation with the verb /ǫny/ (‘make’), it must appear with a nominalizer. In the charts below, roots like this are represented by ‘friend’, as in (11). Some of these roots are considered traditional noun roots, while others are listed as deverbal nouns in some dictionaries.

The two Seneca examples in (14) and (15) illustrate the same asymmetry. The nominalizer is needed for incorporation, as shown in the (b) examples, but not for a full DP, as in the (a) examples.

Finally, the Oneida examples in (16) and (17) illustrate the same point.

In summary, we see that the nominalizer is usually either absent in both noun incorporation and full DPs, or present in both structures. There are some cases where the nominalizer is present only in noun incorporation, but is not found on DPs. The converse, however, is not attested. There are no cases in which the nominalizer is present in DPs but absent in noun incorporation. In the next section we consider these properties in light of three recent proposals in the literature on the categorization of roots.

4. Previous analyses of roots and categories

We begin with the traditional proposal that all roots are specified for lexical category (Chomsky Reference Chomsky, Jacobs and Rosenbaum1970). We then discuss the Bare Root Hypothesis, which proposes that lexical roots are devoid of grammatical information, including categorial informa- tion (Borer Reference Borer1984, Reference Borer2005; Marantz Reference Marantz2001), and then move on to the Roots as Nouns Hypothesis (Kayne Reference Kayne2009).

First, let's consider a traditional analysis in which all roots are classified either as verbs or as nouns. Per Chafe (Reference Chafe2012), adjectives are absent in Northern Iroquoian. Consider for a moment the selectional restrictions of verbs. It is clear they can take DPs as internal arguments. The fact that, at least some of the time, the internal argument requires an overt nominalizer strongly suggests that verbs require a complement that is labelled as nominal.Footnote ⁷ Thus, we propose the following selectional restriction on verbs.

1. (18) Verbs select either DP or nP as a complement.

Under such an analysis, nominal roots require no nominalizer either for full DPs or for noun incorporation. Verbal roots require a nominalizer in both cases. Roots in the mixed category are more complicated, behaving like nouns when they appear in full DPs, and like verbs when they undergo noun incorporation. One could assume that such roots have two homophonous lexical entries (one noun and one verb), but such an ad hoc proposal does not explain why only the verbal form can be chosen for noun incorporation. Such a proposal overgenerates, allowing for the unattested pattern in which a nominalizer is found with full DPs but not with noun incorporation. One could also make an ad hoc proposal that certain nominal roots, for some reason, must take a null verbalizer before undergoing noun incorporation, thus requiring a nominalizer. Again, nothing would rule out a parallel situation, in which certain nominal roots take a null verbalizer when they appear in a full DP, thus requiring a nominalizer. In sum, assuming a traditional analysis in which all roots are categorially specified fails to explain the asymmetry described above. Tables 1 and 2 summarize these two proposals, respectively.

Table 1. Categorial specifications in Northern Iroquoian assuming categorized homophonous roots

Table 2. Categorial specifications in Northern Iroquoian assuming categorized roots and null verbalizer

Next, we consider the Bare Root Hypothesis. According to Marantz (Reference Marantz2001), all roots are bare and must eventually be categorized. When no overt categorizer is present, a null n, v, (or a) must be assumed. In Northern Iroquoian, what we tra- ditionally call nominal roots would require a null n both in full DPs and in noun incorporation, while what we traditionally call verbal roots would require an overt nominalizer in both environments. The mixed roots appear with a null n in full DPs and with an overt nlzr in noun incorporation. However, nothing rules out the unattested pattern in which a bare root appears with an overt nlzr in a full DP and with a null n in noun incorporation. Table 3 summarizes the arguments.

Table 3. Categorial specifications in Northern Iroquoian assuming bare roots

Finally, we consider the Roots as Noun Hypothesis (Kayne Reference Kayne2009). Kayne tentatively suggests that there may be no need for n, if all roots are categorially specified as N. Nevertheless, cross-linguistically we find many cases of overt nominalizing morphology, including in Northern Iroquoian, as we have seen. Kayne recognizes that derived nouns exist (such as the removal of the evidence) and sketches a tentative proposal. He suggests that suffixal nominalizers may have the same analysis as the free-standing noun fact, namely that they are relative clauses (cf. the fact that the evidence was removed).Footnote ⁸ The structure he suggests for removal of the evidence is given below. We have filled in the relevant functional projections based on his discussion, but we acknowledge that this is an extrapolation from his proposal. He proposes that the English nominalizer, -al, is a nominal root, selected by a ghost P. The PP (P -al) modifies the vPFootnote ⁹ and is followed by movement of the object the evi- dence for Case (to ZP), followed by merger of of. This step is not vital to the current discussion. The ghost PP then raises to the specifier of a higher functional projection (YP) and the vP undergoes remnant movement to the specifier of a yet higher functional projection (WP). Kayne specifically mentions the ghost PP, but does not mention the other unnamed functional projections, some of which could presumably be part of the extended nominal projection.

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We note first that nominalized constructions in Northern Iroquoian are quite different from the removal-type constructions in English, so it is not clear that the analysis could be carried over easily. Crucially, in the English nominalizations the argument taking properties of the root are still present, while they are absent in Northern Iroquoian. Nevertheless, we examine how the Northern Iroquoian facts fare under a Kaynean analysis in which all roots are nouns.

Nouns have a straightforward explanation under the Roots as Nouns Hypothesis. Roots such as tobacco are simply N. As such, they require no nominalizer to form a full DP, nor do they need one in order to be incorporated.

Traditional verbal roots (the write-type) have two possible analyses under Kayne's approach. Kayne argues that verbs are largely derived by conflation of a noun with a v, in the sense of Hale and Keyser (Reference Hale and Keyser2002). He also suggests that many verbs are quite likely light verbs rather than lexical verbs. In the conflation case, the root is composed of N + v, and with light verbs, the root is composed of just v. Under this view, forms such as write in Northern Iroquoian would be simply a light verb (v). Such forms would require a nominalizer either to form a DP or to be incorporated.

The curious case is forms such as friend. Recall that such forms require a nomi- nalizer only if they undergo NI. If we assume that such forms are obligatorily v + N, leaving aside the question of how to ensure that the N root friend obligatorily merges with v before undergoing further derivation, we have a possible explanation for the facts. Noun incorporation boils down to selection as in (18). The structure v + N requires a nominalizer in order to be selected by a verb. However, the full DP is more difficult to account for. We would have to assume that v is somehow invisible for the purposes of forming a full DP with friend-type roots but not with write-type roots. The relevant forms are repeated in (20), and the putative trees under the Roots as Nouns Hypothesis are shown in (21).

Kayne's analysis does, however, offer an account of why the unattested category does not surface. The three kinds of roots in Northern Iroquoian are N, v, and v + N, respectively. There is no conceivable way of forming the fourth, unattested type. However, it is unclear why the N root in the friend-type constructions cannot be incorporated independently of v, as it is already nominal. One would have to say that certain N roots are lexically encoded as requiring a v before undergoing further operations. The following table summarizes these conclusions.

Table 4. Categorial specifications in Northern Iroquoian assuming N roots

The Roots as Nouns Hypothesis does rule out the unattested pattern. Crucially, the only three possible patterns are N, N + v, and v. N roots, such as tobacco, do not require a nominalizer either to form full DPs or to undergo NI, as expected. The v forms, such as write, require a nominalizer in both cases, as expected. What is left unexplained is why the N + v forms, such as friend, require v.

To summarize, we have examined three proposals for the nature of roots and lex- ical categories, and we have shown that all three are unable to explain the facts regarding nominalizers in Northern Iroquoian. Crucially, the first two proposals, the traditional approach in which roots are categorized and the Bare Roots Hypothesis overgenerate, producing the unattested pattern. The Roots as Nouns Hypothesis captures the three categories observed, but does so at the expense of having to stipulate that certain roots (e.g., friend) must merge with v before undergoing further derivation. Also unexplained is why no nominalizer is needed in order for the vP in (21a) to participate in DP formation. We now turn to our proposal, which generates the observed pattern without overgenerating the unattested pattern, and does so with fewer stipulations than the Roots as Nouns Hypothesis.

5. Proposed analysis

Section 2 outlined the important details of nominal and verbal structure in Northern Iroquoian and discussed an asymmetry in the behaviour of some roots in the formation of DPs and noun incorporation. In the previous section, we analysed this asymmetry using three well known hypotheses on lexical categories and all were shown to be problematic.

5.1 Nominal structure

An important part of our analysis relies on the fact that the noun class suffix (NFS) appears outside the nominalizer, as can be seen in (10b) above, repeated here as (22).

Following the Mirror Principle (Baker Reference Baker1988), we deduce that the nominalizing head (nlzr) is structurally lower than the noun class suffix head (nfs, which we call n _cl). Thus, we assume an extended nominal projection in the sense of Grimshaw (Reference Grimshaw1990) with a partial structure as in (23). We assume that the nominal prefix heads a functional projection somewhere between DP and n _clP, but its exact location does not impinge on the current discussion. For convenience, we show the nominal prefix in D in the derivations below, but leave the exact location to future research.

1. (23) DP > … > n _clP > n _nlzrP > root

Recall from (18) above that we assumed that the complement to the verb must be nominal, clausal complements notwithstanding. In order to make the proposed analysis work, one more assumption is needed:

1. (24) A full DP contains a n _cl, which selects a categorized complement.

This assumption requires some discussion and builds on the observation that full DPs require a nominalizer some of the time in the Northern Iroquoian data discussed here. Observe in the following English examples that some categorizing morphology can appear with a bare root.Footnote ¹⁰

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   1. a. mechan-ic; mechan-ism; mechan-ize

   2. b. calcul-ate; calcul-able

Some affixes, however, can attach only to certain categories (Fabb Reference Fabb1988). For instance, -ness attaches only to adjectives and -less attaches only to nouns. Some categorizers, thus, select either a or n, rather than a bare root. It is not unreasonable, then, to propose that n _cl requires a lexical category as a complement. In other words, n _cl selects either something nominal or something verbal, but not a bare root. We will return to the exact specification of the selectional restriction of n _cl. For the moment, we propose that Northern Iroquoian n _cl requires either a nominal or a verbal complement.

Evidence that a verbal complement is possible in DPs comes from examples like (26). The morpheme kli is a verbal root and can appear as a noun without the benefit of a nominalizer.Footnote ¹¹

Such forms can also be verbs. In (27), the Onondaga light verb ki: is shown, which is cognate with Oneida kli.

A nominalizer, however, is required in order to incorporate the complex noun in (26) into a larger verbal complex.

With this background we now present the proposal for the categorial specification of roots in Northern Iroquoian.

5.2 Categorial specification of roots

The above facts fall into place if we assume that some roots are pre-specified as nouns, some roots are pre-specified as verbs, and some roots are truly acategorial. A large subset of Northern Iroquoian roots are pre-specified as nouns (the tobaccotype). As such, they do not require a nominalizer either for full DPs or for noun incorporation. Another large subset of Northern Iroquoian roots are acategorial (the write-type). Such roots require a nominalizer both for full DPs and for noun incorporation. Finally, a small number of roots are pre-specified as verbs (the friend-type). This small class of roots requires a nominalizer only for noun incorporation since the n _cl in full DPs can be satisfied by a verbal complement. Table 5 summarizes these three situations.

Table 5. Categorial specifications in Northern Iroquoian

While the categorial specifications in Table 5 derive the properties of the nominalizer discussed here, the result is somewhat unexpected. Specifically, the root meaning ‘friend’ is classified as a verb. Aside from the properties related to the nominalizers, the categories proposed here exhibit some traditional morphosyntactic differentiation. As Mithun (Reference Mithun, Vogel and Comrie2000) makes clear, and as is clear from the discussion throughout this article, the categories of N and root have clear morphological differences. What is less clear is whether there is a difference between category V and category N, as a reviewer points out. Roots in both these classes are traditional nouns. Koenig and Michelson (Reference Koenig and Michelson2010) discuss the exceptional nature of kinship terms in Oneida, noting one property they have is that they require the nominalizer for incorporation, but not for appearing as a full DP. We leave for future research how to reconcile the facts in Koenig and Michelson (Reference Koenig and Michelson2010) with the proposal here. The same reviewer asks how roots are identified in Northern Iroquoian and how they relate to the ontological notions of roots. Baker (Reference Baker2003) gives an excellent overview of the history of the linguistic theorizing of lexical categories. He reminds us that ontological distinctions do not provide a reliable foundation for understanding lexical categories. Pairs such as destroy and destruction both refer to the same concept, but one is expressed as a verb and the other as a noun. Some nouns such as party refer to an event and some verbs such as know do not. The reader is invited to consult Baker and the references cited therein for a full discussion.

We follow the structuralist tradition of ascertaining the category of a linguistic object (in this case the root) by examining the morphosyntactic frames in which it can be found. For instance, nouns can appear with plural morphology and verbs can appear with aspectual morphology. Baker (Reference Baker2003) gives an excellent discussion of the difference between verbs and nouns in Mohawk; however, since his goal is to give a general cross-linguistic framework in which to understand lexical categories, he does not discuss the friend-type roots. In the same spirit, then, we take the behaviour of the nominalizer as a further morphosyntactic diagnostic of lexical category.

5.3 Derivation of DPs

Recall that the extended nominal projection includes a n _clP, and that n _cl selects a categorized complement, following the structure sketched in (24). Thus, a nominalizer is required only for acategorial roots. We illustrate here the derivation of a DP based on each of the three types of roots we proposed. First, we illustrate the derivation of a DP formed from an N root. This represents a prototypical noun in Northern Iroquoian. Consider (29a), repeated from (6) above, and its derivation in (29b). We assume head movement for simplicity, although the structures below could be made consistent with an XP movement account along the lines of Barrie and Mathieu (Reference Barrie and Mathieu2016). We therefore believe that the question of head movement versus XP movement does not affect the arguments put forward here.

Next consider a DP formed from a V root. The Onondaga example in (30), repeated from (11), shows the derivation for ‘my friend’.

Finally, consider a DP formed from bare root. Since the root is not categorized, a nominalizer is necessary to make a well-formed DP. This is shown in the Cayuga example in (31), repeated from (9b).

5.4 Derivation of noun incorporation

Next we consider the derivation of noun incorporation. Recall that in Northern Iro- quoian, noun incorporation is typically formed by the incorporation of a nominal root into the verbal complex. The nominalizer is present only when the incorporated root is not pre-specified as nominal, as predicted by the assumption that verbs select a nominal complement. Consider the Onondaga example in (32a), repeated from (6). The structure of the tree before movement operations is shown in (32b). Since yękw is pre-specified as N, no nominalizer appears.

The nominalizer is needed in order to incorporate V roots. Crucially, these are the roots that do not require a nominalizer to form full DPs. An example of this sort is shown in (33), repeated from (11).

Finally, the nominalizer is needed in order to incorporate bare roots, since verbs require a nominal complement. An example of this is given in (34).

The tree in (35) shows the pre-movement structure for (34). The verb selects a nominal complement, which subsequently undergoes incorporation. Thus, in all three cases, the verb selects something nominal, either nP or N.

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5.5 Derivation of verbs

In this section we extend the analysis of roots to give a preliminary analysis of verbal constructions. So far, we have considered the role of nominalizers in the formation of full DPs and in noun incorporation. We have not considered the extended verbal projection. As we have seen above, V roots and bare roots form verbs without the benefit of categorizers. One may wonder why bare roots do not need a v along the lines of Marantz. Borer (Reference Borer2005) suggests that categorial information can be gleaned by higher inflectional morphology. Thus, the higher functional projections such as aspect, agreement, and mood provide enough information to signal that the construction in question is a verb. Recall that the nominalizer was used not to give categorial information, but rather to satisfy selectional restrictions.

Traditionally, Northern Iroquoian languages are not described as having verbalizers (in comparison to the nominalizers described above, which are well documented in the traditional Iroquoian literature). However, there is a small class of forms with properties that are similar to those of light verbs. In particular, these light verbs require noun incorporation, akin to what Johns (Reference Johns2007) describes for Inuktitut. Consider (36), as well as (26) above.

Unlike the nominalizer, which is purely grammatical, these light verbs do carry some meaning. Given the analysis we proposed above, we make the following ob- servations about verbal structures. N roots cannot appear as verbs, unless a light verb is present as in (36). V roots and bare roots can appear as verbs without any special morphology. Thus, true verbalizers are needed only to form a verbal structure from a lexical noun.