You have nothing to lose by telling the truth.
你講真話是不會吃虧的。
I'd have nothing to do with him, if I were you.
如果我是你，我就不會跟他有任何瓜葛。
'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。