can: yes, you can /no, you can't
may: yes, you may/no you can't
must: yes, you must/ no, you needn't or no, you don't have to. 注意mustn't是禁止的意思。
need: yes, you need/no you needn't
can 肯定回答 yes,I can. 否定回答No,I can't.
may肯定回答 yes,I can. 否定回答No,I can't.
must肯定回答 yes,I will. 否定回答No,I won't.
need肯定回答 yes,I need. 否定回答No,I needn't.
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