新概念英语第二册49-02

Lesson 41 Do you call that a hat?

need的否定形式 : needn't don't need

regretted doing sth.

needn't have done : 原本不必做, 但是做了

You needn't have bought it.

remind sb. of sth.

needn't have done : 强调过去的动作不必做

needn't do : 现在的动作也不必做

never ＝ not...too...无论...也不为过

I can never thank you too much. : 感激不尽

Drinking water can never be too clean. 饮用水越干净越好.

A wife can never complain too much. 妻子怎么罗嗦也不为过.

need : 需要

needn't : 非实义动词, 情态动词, 无时态变化的, 也没有人称

don't need : 实义动词有任意一种时态, 有人称变化