关你何事？
有此人老爱问一些跟自己没关系的问题，若是被问烦了你就可以回他一句“What's it to you?”关你何事？
e.g:

A:What did you get on the test? 你考试考了几分？
B:What's it to you? 干你什么事？
A:How was your date with Carol last night?
你跟卡罗昨晚的约会如何啊？
B:What's it to you?Do you like her or something?
关你什么事？难道你喜欢他？