not need to和 needn't区别是什么？_语法学习技巧

not need to和 needn't区别是什么？

文章来源：未知文章作者：enread 发布时间：2021-10-29 05:10 字体： [大中小]　进入论坛

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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
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
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
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
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
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
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
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
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
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。