sentences:  Negation is done with the adverb "not", which precedes the main verb and follows an auxiliary verb.A contracted form of not "-n't" can be used as an enclitic attaching to auxiliary verbs and to the copula verb "to be".Just as with questions, many negative constructions require the negation to occur with do-support, thus in Modern English "I don't know him" is the correct answer to the question "Do you know him?