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Must; needn't Can; may Can; must May; mustn't
finishes will be finished is finished will finish
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shouldn't needn't mustn't won't
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must,can need,can may,must can,may
Watch TV; useful Watch TV; usefully Watching TV; usefully Watching TV; useful
should not can’t must not may not
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Can;must May;mustn’t May;may not Must:must
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sit on… watch sit on …watching sit… watching sit… Watch
may not needn’t can’t mustn’t