(don’t) need sth
(don’t) need to do 肯:must, have to, ought to, should Must they do…? Yes, they must.
No, they needn’t/don’t have to. must & have to must
have to 主观/客观
主观 客观 时态
现在,将来 多种 表推测 √ × 询问意愿 √ × 否定意 禁止,不允许
不必
must表主观意志,而have to表由于客观因素不得不做完成的事情。 Must没有过去式,除在间接引语中可表示过去的时间。在直接引语中表示过去的时间用had to代替。 I told her that she must give up smoking. She said, “We had to get everything ready that night.” 比较must & have to 注意对need问句的回答:
--Need I finish the work today?
--Yes, ________________.
No, ________________.
No, ________________. you must you needn’t you don’t have to needn’t 对其它情态动词的回答:
--Shall I tell John about it?
--No, you __________.
--Must we do it now?
--No, you __________.
needn’t
(don’t have to)
needn’t (don’t have to) Could I borrow your dictionary?(委婉)
---- Yes,you can/may.
Sure. Go ahead.
Please yourself. May I take this seat?(第一人称疑问句)
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