1
高中英语语法新体验——从经典例句开始
1.6.8.2 2.needn't+不定式的完成式

2.needn't+不定式的完成式

“needn't+不定式的完成式”结构表示过去本来不必做某事却做了。You needn't have bought the house.

你本来不必买下房子的。

She needn't have been worrying about it.

她没有必要一直担心这个。

提示:

didn't need to和needn't have done的含义是有区别的,请对比:

I didn't need to go to the station.(因为没有必要而不曾前往。)

I needn't have gone to the station.(本无必要,却在过去某个时刻去了车站。)