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mustn’t ; must needn’t ; must can’t ; must needn’t ; may
mustn’t may not couldn’t needn’t
Must ; needn’t Can ; may Can ;must May ; mustn’t
can't mustn't must needn't
couldn’t; may can’t; can needn’t; can may not; must
must，can need，can may，must can，may
needn’t mustn’t don’t may not
mustn’t may not couldn’t needn’t
finish to finish is finished be finished
may,must may ,could must, need could,can’t
Can;must May;mustn’t May;may not Must：must
as soon as you can as careful as you can as quick as possible as soon as possibly
mustn’t may not couldn’t needn’t
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