come的过去式和过去分词是什么意思

例句

1、Two police officers came into the hall.

两位警官走进大厅。

2、Eleanor had come to visit her.

埃莉诺来看过她了。

3、He came to a door that led into a passageway.

他来到一扇门前，这扇门通往一条走廊。

4、Thewatercameuptomychest.

水淹到了我的胸部。