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However Whatever Whichever Wherever
can’t needn’t mustn’t may not
Can；don’t Must；needn’t Must；mustn’t May；can’t
Yes, we can No, we can’t Yes, we must No, we needn’t
to finish finishing finish doing
needn't , may mustn't, may can't can needn't, must
don't needn't mustn't can't
What an easy work How easy What hard work How hard--working
don't needn't mustn't can't
allow to allow for allow of allow into
to help help helping helped
Whatever; that However; as Whatever; which However; that
don't needn't mustn't can't
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