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Must; may Must; mustn’t May; needn’t May; mustn’t
May ; shouldn''t Can ; needn''t Must ; can''t May ; mustn''t
can't mustn't must needn't
mustn’t may not couldn’t needn’t
shouldn't may not can't needn't
is raining; must have gone rained; would go have rained; could have gone was raining; should have gone
is raining; must have gone rained; would go was raining; should have gone have rained; could have gone
finish to finish is finished be finished
may not mustn’t couldn’t needn’t
Must, mustn’t Might, wouldn’t Need, mustn’t May, had better not
May ; shouldn''t Can ; needn''t Must ; can''t May ; must
is raining；must have gone rained；would go was raining；should have gone have rained；could have gone
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