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Don’t mention it. Don’t thank me Don’t worry Don’t you think so
must not need not would not might not
whether, whether whether, if if, whether that, if
Don’ t mention it Thank you Don’ t worry I’ d like to
not try to worry tried not to worry don’t try to worry tried to not worry
must not need not would not might not
worry; with worry about; with worry; on worry about; on
What about Why not What if(要是……,怎么样) What for
will he come; he comes he will come; he comes he comes; he will come he will come; he will come
will come; will come will come; comes comes; will come comes; comes
don’t need worry needn’t to worry don’t need to worry need not to worry
must not might not should not would not
will arrive; arrives arrives; will arrive arrives; arrives will arrive; will arrive
will come; came comes; will come will come; comes comes; came
when;whether if;whether that;if whether;if
must not need not would not might not
mustn’t needn’t may not can’t
worry about; worry worry; worry about worries; worry about worries; worry
mustn't needn't may not can't