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mustn’t ; must needn’t ; must can’t ; must needn’t ; may
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Must ; needn’t Can ; may Can ;must May ; mustn’t
can't mustn't must needn't
must，can need，can may，must can，may
must finish will finish must be finished won’t finish
Can; can’t May; not Must; needn’t Can; not
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
to do, to go to do; going doing; to go doing; going
as soon as you can as careful as you can as quick as possible as soon as possibly
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