16.9 need "不用做"和"本不用做"
_假造语气
16.9 need "不用做"和"本不用做"
didn't need to do默示过往不用做某事,毕竟上也没做。
needn't have done默示过往不用做某事,但毕竟上做了。例如：
John went to
the station with the car to meet Mary, so she didn't need to walk back home.
约翰开车往车站接玛丽，所以她不用步辇儿回家了。
John went to the station with the car to meet Mary, so she needn't have
walked back home.
约翰开车往车站接玛丽，所以她本不用步辇儿回家了。（ Mary步辇儿回家了，没有赶上John的车。）
典范例题
There was plenty of time. She ___.
A. mustn't have hurried B. couldn't have hurriedC.
must not hurry D. needn't have hurried
谜底 D。needn't have done.意为"本不用"，即已经做了某事，而时理想上不需要。
Mustn't have done用法不准确，对过往发作的事变举行否定性料到应为couldn't have done, "不年夜概已经"。
must not do不可以（用于通俗现在时）。

关键字：必做和不用做的准备 asme b16.9 ansi b16.9 不用在乎我是谁 不用再怀念我