know的过去式：knew

v.知道;知悉;了解;认识到;懂得;意识到;确信;确知;肯定

例句：

As far as we knew, there was no cause for concern.

就我们所知，没有什么要担心的。

She knew that tenure of high political office was beyond her.

她知道自己与显赫的政治职位无缘。

He was much loved by all who knew him.

认识他的人都很喜欢他。

They knew nothing about her save her name.

除名字外，他们对她一无所知。

She knew the limits of her power.

她知道自己的权限。