treat的過去式和過去分詞是什麼

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.

學生對於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。