The Dakelh verb is extremely complex. A single verb may have hundreds of thousands of forms. Verbs are marked for the person and number of the subject, object, and indirect object, tense, mood, numerous aspectual categories, and negation. The subjects of verbs, and in some dialects objects and indirect objects, distinguish singular, dual, and plural numbers. Verbs are also marked for numerous "derivational" categories. For example, a basic motion verb, such as "walk" has derivatives meaning "walk into water", "walk into a hole", "walk ashore", "walk around" and "walk erroneously" (that is, "get lost walking").