英语的几个句子

He was the person who/whom/that I met yesterday(宾语)
It was the book which/that I found(宾语)
He was the person who/that had 3 houses(主语)
It was the book which/that was in the desk(主语)

Who which is in that.
Whom is that which.

what do you want to express ? you'd better say sth clearly!