deal的過去式和過去分詞是什么

　　deal雙語例句

　　1、I only deal with schools.

　　我們只和學校做買賣。

　　2、How do you deal with it and what should I do with it?

　　你是怎樣處理這件事的？我又該怎么處理？

　　3、What should we do to deal with this situation?

　　我們應該做什么來應付這種情況呢?