Sentence 3 IS grammatically correct!!! As for it being more common, contractions are far more common in speech, while sentence n. 2 is more likely to be found in formal writing.
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Jackson6612In grammar, a clause that is in the interrogative has its subject following do, be, have, or a modal verb.The pronoun goes in the first possible position after do, be, have, or a modal verb. In a case where that verb is part of a contraction the first possible position is obviously after the whole contraction.
Jackson66121: I should not respect you.
2: Should I not respect you?
3: Shouldn't I respect you?
The sentences 2 and 3 are the interrogatives made from the sentence 1. The sentence 3 is much more common than sentence 2. In grammar, a claus
Yoong LiatHi JacksonTheSentences 2 and 3 are the interrogatives made fromthesentence 1.TheSentence 3 is much more common than sentence 2. In grammar, a clause that is in the interrogative has its subject following 'do', 'be', 'have' or a modal verb. That means