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may，mustn't must，must may，may can，needn't
look like look at look for look after
can’t mustn’t don’t have to needn’t to
couldn’t; may can’t; can needn’t; can may not; must
mustn’t may not couldn’t needn’t
must，can need，can may，must can，may
You shall You should You must You will
needn’t mustn’t shouldn’t can’t
look after look at look for look like
mustn’t won’t don’t needn’t
can’t mustn’t shouldn’t needn’t
look after look at look for look up
needn’t mustn’t shouldn’t can’t
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