must和need相同:Yes, must. No, needn#39;t/don#39;t have to
may和can could相同:Yes, may/can/could. No, mustn#39;t/#39;d better not/can#39;t.
shall:Yes, can/may. No, can#39;t.
should:Yes, should. No, shouldn#39;t.
will和would差不多:Yes,do/will. No,won#39;t/thanks.
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