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needn’t have dropped should have dropped would have dropped must have dropped
haven’t you mustn’t you needn’t you don’t you
Are；having Are；have D0；have Can；have
doesn’t has doesn’t have don’t have aren’t have
having will have have don't have
had come; wouldn’t have missed came; wouldn’t have missed have come; would not miss come; will not have missed
didn't make progress haven't made progress wouldn't have make progress wouldn't make progress
have they haven’t they didn’t they don’t they
Are ; having Are ; have Do; have Can; have
don't have will not have am not won't
couldn’t mustn’t can’t needn’t
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