treat的过去式和过去分词是什么

　　例句：

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

　　那绝不是对待他人的方式。

　　2、Students were angry at being treated like children.

　　学生对于把他们当小孩子对待感到气愤。

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

　　咱们到外面去吃午餐，我请客。

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

　　我打算给自己买双新鞋。