关于need not do用法及扩展

2018-05-2616:37:38 发表评论 142

事实上,need not/needn't do不仅有上述表示“不必,不需要”的基本用法,还有其他用法。

关于need not do用法及扩展

一、先来看need not do的基本用法:

need not do(或needn't do):表示“不必做某事”或“不需要做某事”等意思

(1)You needn't clean the house today.你今天不必打扫房屋。

改成:

(2)You don't need to clean the house today.

(3)You don't have to clean the house today.

二、need not do还有什么用法呢?

1.表推测:

needn't do(或don't have to do):不一定是...,不一定做...

(1)Failing the exam need not necessarily be a painful experience.

(2)Failing the exam does not necessayily have to be a painful experience.

译:考试失败不一定就意味着是一次痛苦的经历。

三、开启新话题:说一说need not have done与did not need to do的区别。

1.概述:

Need not do和don't need to do都可以表示“不必”,那它们的过去式含义相同吗?Need not do的过去时needn't have done(不必做但做了);don't need to do的过去时didn't need to do(不必做,所以没做)。

2.needn't have done的用法:

虚拟含义,意思是“过去本来不必做某事,但实际做了”

请对比下面这组例句:

(1)You needn't apologize.你不必道歉。

(2)You needn't have apologized.你本来用不着道歉的。

3.didn't need to do的用法:

没有虚拟含义,意思是“过去不必做,所以就没做”。

请对比下面这组例句:

(1)It didn't rain yesterday,so I needn't have taken an umbrella.因为昨天没下雨,所以我本来是不需要带伞的。(尽管我昨天带伞了)

(2)It didn't rain yesterday,so I didn't need to take an umbrella.因为昨天没下雨,所以我不需要带伞。(因为昨天没有下雨,所以我不需要带伞)

关于need not do的用法和扩展内容希望能对大家有帮助。

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