In some ways, one hesitates to include defective verbs in the present volume since, generally speaking, they are hardly ever used, and even then, only extremely limited parts of them occur. In numerous cases, they are classed as R3, or are already on the point of exiting the language. Parts of some verbs are, of course, standard R2, like déchu. What is certain is that, since these verbs are defective and can vary even in usage and in form, no two French speakers necessarily agree on these features. Nevertheless, given that defective verbs form part of the French language, however tenuously, it seems appropriate to accord them treatment since some parts of certain defective verbs find themselves in current use.