| needn’t 不必（情态） = don’t have to (实义) |
- You needn’t / don’t have to work such long hours.
- need I...?(情态) / Do I need...? 实义动词
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- Need I go out? = Do I need to go out? 做为实义动词时连接其它动词后面加 to do
- Need you leave so soon? need 用于疑问句时，问者往往希望得到否定的回答(肯定句用 must，have to，ought to 或 should)
- Yes, you must 回答可以用 must/had to . / No, you needn’t . 否定形式的回答可以用 needn’t
- Need you have told him about my plans?
- Yes, I had to. / No, I needn’t have.
- Need I type this letter again?
- I must go to the dentist this moring. 表示必要时，must 的语气比need 要强
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didn’t have to = needn’t have done
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- He needn’t follow me .情态动词后面不能直接用名词做宾语
- A doesn’t need B needn’t to C didn’t need to D needs.
- You needn’t have told me that. I know it is. 情态动词 need 后接动词原形
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- I needn’t have gone to the office yesterday. (完成式)表示说话人让对方选择或允许对方可以不做某事的主观意图
- I didn’t have to / didn’t need to go to the office yesterday. 过去式
- mustn't VS. needn't → You musn’t read it bed. It’s bad for your eyes.
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| need doing sth. 用主动表达被动含义 |
- 这里 need 属于实义动词, 动词 ing 相当于名词来理解
- 有时态和人称变化,否定式为: don’t need doing
- need doing 表达被动含义, 如: Your shoes need washing. 你的鞋子需(被)洗了 Your hair needs cuting.
- want doing 用主动表示被动含义(主语一定是物)
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| need to be done (主语：人、物) |
The child need to be … |
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be bad for… 对…有害
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- Smoking is bad for your health. 抽烟有害你的健康
- You mustn't make a noise. The children are asleep. 你不应吵闹, 孩子们都睡了
- You needn't drive so quickly. We have plenty of time.你不必开得那么快, 我们有足够的时间
- =You don't have to(haven't got to) drive so quickly. We have plenty of time.
- You mustn't smoke in a theatre. It is forbidden. 你不应该在剧场里抽烟, 这是不允许的
- You needn't come with us if you don't want to. 如果你不想去, 你不必和我们一道去
- =You don't have to (haven't got to) come with us if you don't want to.
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