You have nothing to lose by telling the truth.

　　你講真話是不會(huì)吃虧的。

　　I'd have nothing to do with him, if I were you.

　　如果我是你，我就不會(huì)跟他有任何瓜葛。

　　'I have nothing to say to you,' she said icily.

　　“我對你沒什么可說的。”她冷冷地說。

　　If you take my advice you'll have nothing more to do with him.

　　你要是聽我的勸告，就不要再和他有什么瓜葛。