not need to和 needn't区别是什么？-凯发k8官网

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 ¹, you've studied lots. 

you needn't worry about the exam, you've studied lots.

i don't need to go to work tomorrow ² 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 ^{3 4} passed the ⁵.

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 ⁶ about the exam. it ⁷ really easy.

i needn't have gone to work today. i didn't ⁸ it was a holiday. what a ⁹!

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