come的過去式和過去分詞是什么意思

　　例句

　　1、Two police officers came into the hall.

　　兩位警官走進大廳。

　　2、Eleanor had come to visit her.

　　埃莉諾來看過她了。

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

　　他來到一扇門前，這扇門通往一條走廊。

　　4、Thewatercameuptomychest.

　　水淹到了我的胸部。