laugh的過去式和過去分詞

例句：

1、We had a good laugh about it afterwards.

我們後來對此笑了個痛快。

2、I tried hard not to laugh.

我強忍住不笑出來。

3、We laughed and that helped ease the tension.

我們笑了，因而使緊張的情緒緩和下來。