know既可用作不及物动词，也可用作及物动词。用作及物动词通常意思为“认识、熟悉、体验、经历”，用作不及物动词时意思是“知道、了解、懂得”，那么know的过去式和过去分词是什么呢？

过去式：knew

过去分词：known

现在分词：knowing

第三人称单数：knows

She wouldn't change it, even though she knew it was wrong.

尽管她知道这错了，她也不肯改变。

He was much loved by all who knew him.

认识他的人都很喜欢他。

She knew the limits of her power.

她知道自己的权限。

I knew quite early on that I wanted to marry her.

我老早就知道我想娶她。

I wish I knew what they were driving at.

我要是知道他们的用意就好了。

She tried not to let slip what she knew.

她尽量不把她所知道的事泄露出去。

She knew she must not fall prey to his charm.

她清楚她绝不可以被他迷住。

If only I knew her name.

我要是知道她的名字就好了。

I only knew the official version of events.

我对事情的了解仅限于官方的版本。