not need to和 needn't区别是什么？

时间：2021-10-29 05:10:55

（单词翻译:单击）

动词 “need” 的意思是 “需要，必须”。它的否定形式有两种：“not need to” 和 “needn't”。它们有区别吗？现在时态和过去时态下的这两个否定形式在用法上一样吗？
 
用法总结
1 在现在时态下，“(do) not need to” 和 “needn't” 表达的意思通常是一样的，即 “不需要，用不着”。“Needn't” 比 “not need to” 稍微更正式一点。
 
You don't need to worry about the exam1, you've studied lots. 
You needn't worry about the exam, you've studied lots.
I don't need to go to work tomorrow as2 it's a holiday.
I needn't go to work tomorrow as it's a holiday.
 
2 在过去时态下，“(did) not need to” 常用来表达我们之前没有做某事，因为 “不需要”。
 
He didn't need to worry about the exam. He had3 already4 passed the course5.
I didn't need to go to work today, so I stayed in bed.
 
3 在过去时态下，“needn't + have + 动词过去分词” 常用来表达我们之前做了某事，但其实 “本不必” 做。
 
He needn't have worried6 about the exam. It was7 really easy.
I needn't have gone to work today. I didn't realise8 it was a holiday. What a mistake9!

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1 exam qnRxI     
n.(=examination)检查；考试
参考例句：
  • I hope to pass this exam.我希望通过这次考试。
  • His exam results were good.他的测验成绩不错。
2 as pNiyL     
conj.按照；如同
参考例句：
  • He got work in a hotel as a waiter.他在一家旅馆找到了当服务生的工作。
  • In the hotel,the old men were drinking away as usual.在旅馆里，这些老人和往常一样喝个不停。
3 had FeBxb     
vbl.have的过去式和过去分词；conj.有
参考例句：
  • I just had a good idea!我有个好主意！
  • The boy had a small branch of a tree in his hand.这个男孩手上拿一条小树枝。
4 already wLByk     
adv.已经
参考例句：
  • We have eaten already.我们已经吃过了。
  • I've been there already,so I don't want to go again.我早已去过那里了，所以我不想再去了。
5 course 1zcx6     
n.课程，讲座，过程，路线，一道(菜)
参考例句：
  • The college course was then cut to three years.大学学制那时缩短到三年。
  • Of course,I don't always sleep in the afternoons.当然，我并不总是在下午睡觉。
6 worried petzJ1     
adj.烦恼的，为难的，焦虑的
参考例句：
  • He was worried about the safety of me.他为我的安全担心。
  • He worried his father to buy a new car.他苦苦缠着父亲要买一辆新车。
7 was bglwv     
v.(is,am的过去式)是，在
参考例句：
  • He said he was right.他说他是正确的。
  • He was cold and hungry.他又冷又饿。
8 realise realise     
v.觉悟；明白；实现；兑现
参考例句：
  • Wish you realise your dreams as early as possible!祝愿您早日实现自己的梦想！
  • How much did you realise on the house?这所房子你们出售后赚了多少钱？
9 mistake ADDxY     
n.错误，误会；v.犯错，误认
参考例句：
  • Don't make the same mistake again.不要再犯同样的错。
  • I made a mistake but you should give me a chance.我犯了一次错误，但你应该给我一次机会。

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