英语连词成句,thank,i,PENCIL,IT,HIS,IS

1.I think it is his pencil.
我想它是他的铅笔.
2.How do you know him?
你怎么认识他的?
3.This is not my gold ring.
这不是我的金戒指.
4.That is your lost key and find it in the case.
那是你丢失的钥匙,在盒子里找到的.
回答的快吧?哈哈