Negation and Questions
Negation of verbs usually takes place with the addition of the particle not (or its shortened form n't) to an auxiliary or copular verb, with do-support being used if there is otherwise no auxiliary. However if a sentence already contains a negative word (never, nothing, etc.), then there is not usually any additional not.
Questions (interrogative constructions) are generally formed using subject–auxiliary inversion, again using do-support if there is otherwise no auxiliary. In negative questions, it is possible to invert with just the auxiliary (should we not help?) or with the contracted negation (shouldn't we help?).
For full details on negation and question formation, see do-support, English auxiliaries and contractions, and the Negation and Questions sections of the English Grammar article.
Read more about this topic: Pluperfect Progressive
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