wash the hand、good at、have the nerve to do、night person、nightmare

1.  Did you wash your hands well? 手洗干净了吗?

2.  Are you good at singing? 你唱歌拿手吗?

3.  I don't have the nerve to sing in front of people. “敢做……， 有做……胆量”。

4.  I'm a night person. 我是个夜猫子。

5.  I had a nightmare. 我做了个可怕的梦。