I want to ask you a favour.

我想请你帮个忙。

Can I ask you some questions?

我可以问你一些问题吗？

Then I will only ask you three.

那我只问你三个问题。

Then I will only ask you three.

“那我只问你三个问题。”

He is going to ask you some questions.

他会问你一些问题。

I have four questions to ask you, sir!

先生，我有四个问题要问您！

I have four questions to ask you, sir!

“先生，我有四个问题要问您！”

Hey, Sally. Can I ask you some questions?

嘿，萨莉。我能问你几个问题吗？

Oh, what did they ask you to help out with?

哦，他们让你帮什么忙？

Hello! I'm a reporter. Can I ask you some questions?

你好！我是记者。我可以问你一些问题吗？