Eg. That will be the day.

有这么一天就好了。

原句：It's not possible.

Eg. He double-crossed me.

他出卖了我。

原句： He betrayed me.

Eg. He's down and out.

他已经完了。

原句：He is finished.

Eg. Drop dead.

走开点。

原句：Go away.

Eg. Take it easy.

不要这么紧张。

原句： Relax.

What's eating you?

你有什么烦恼？

原句：what's bothering you?

Keep an eye on him.

看住他。

原句：Watch him.

He is a fast talker.

他老是说得天花乱坠。

原句：He is always bragging.

I am fed up.

我已经厌倦了。

原句： I am sick and tired.

Please fill me in.

请你把情形告诉我。

原句： Please tell me all about it.