Anonymous ) Can I say "why shouldn't it be" meaning "why not"? No, and you cannot use your other two suggestions, either. Anonymous 2a) Can I say "why shouldn't I go" meaning "why mustn't I go"?
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Anonymous) Can I say "why shouldn't it be" meaning "why not"?No, and you cannot use your other two suggestions, either.
Anonymous2a) Can I say "why shouldn't I go" meaning "why mustn't I go"?'Shouldn't' doesn't mean 'mustn't' anywhere.
Anonymous2b) Can I say "shouldn't I go" meaning "mustn't I go"?