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mustn’t ; must needn’t ; must can’t ; must needn’t ; may
Must; mustn’t Can; mustn’t Must; needn’t May; needn’t
look out look for look after look out for
can; can can’t; must can’t; can must; can
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 have to may are used to
must，can need，can may，must can，may
have been playing play are playing played
finish to finish is finished be finished
may,must may ,could must, need could,can’t
Must; mustn't Can; mustn't Must; needn't May; needn't
can, can’t can, must must, can can, can
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