Could I ask you a question? It's important. 我能问你个问题吗？非常重要。

　　Do you mind if we ask you a few questions? 你介意我们问你几个问题吗？

　　May I ask you a couple of questions? 我能问你几个问题吗？

　　May I ask you a question? 我能问你个问题吗？

　　Sure. What would you like to ask me? 好的，你想问我什么？