know的过去式： knew；
know：v.知道；知悉；了解；认识到；
know的过去分词： known
相关介绍
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。
