Published online by Cambridge University Press: 24 December 2009
Written Tibetan (WT) is unusual among Sino-Tibetan (ST) languages in possessing a relatively complex verb morphology which contains—apart from distinctive ‘prefixes' for intransitive/transitive verb pairs, a phenomenon found elsewhere in ST—prefixes and suffixes for certain tenses as well as a morphologically significant ablaut system, none of which can be found, or at least, none of which are common in other ST languages. The simplest ways of dealing with the problem of the origin and development of this system in the light of comparative ST researches are, firstly, ignoring it, and secondly, coming up with ad hoc theories about its independent development, thereby not affecting the apparently stable edifice of ST in any way.