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Must; needn't Can; may Can; must May; mustn't
do some reading; watch TV doing some reading; watch TV to do some reading; watch TV do some reading; to watch TV
read books; watch TV reading books; watching TV to read books; watch TV read books; to watch TV
Must ; needn’t Can ; may Can ;must May ; mustn’t
shouldn't needn't mustn't won't
May;have to Will;should Can;will Must;need
needn’t mustn’t wouldn’t won’t
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
Can;must May;mustn’t May;may not Must:must
may not needn’t can’t mustn’t
watch; watching watching; watch watch; watch watching; watching
may not needn’t can’t mustn’t