This paper undertakes a detailed analysis of sentential negation in the English language with Chomsky's Government-Binding theory of Transformational Grammar as theoretical model. It distinguishes between constituent and sentential negation in English. The essay identifies the exact position of Negation phrase in an English clause structure. It observes that insertion of "do-support" as last resort meant to derive sentential negation from a declarative that lacks an auxiliary verb is a language specific derivation peculiar to the English language. The paper also analyzes the contraction of "not" to "n't" and its conjoining to an auxiliary verb acting as its host. It observes that this phenomena takes place only when the auxiliary verb is a bound form. The contacted "not" is always bound to its host to form a double head which is fronted in the derivation of a Yes/No question. (Contains 4 notes.)