treat的過去式和過去分詞是什么

　　例句：

　　1、That is no way to treat another human being.

　　那絕不是對待他人的方式。

　　2、Students were angry at being treated like children.

　　學生對于把他們當小孩子對待感到氣憤。

　　3、Let's go out for lunch ─ my treat.

　　咱們到外面去吃午餐，我請客。

　　4、 I'm going to treat myself to a new pair of shoes.

　　我打算給自己買雙新鞋。