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must not won’t can’t may not
may，mustn't must，must may，may can，needn't
must not won’t can’t may not
may not; must must; may not can’t; must must; can’t
must not won’t may not can’t
must not won' t can' t may not
stops to work shop working stop to work stopped working
mustn’t，may mustn’t，must needn’t，can needn’t，must
needn’t; can mustn’t; must mustn’t; may needn’t; must
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worked had worked has worked are working
You must keep your course and speed You may change course and speed as the other vessel must keep clear The other vessel must keep her course and speed Both vessels must keep their course and speed"
must not won’t can’t may not
must not won’t can’t may not
clear it clear to you clear to you it is clear
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