May I ask what you do for a living?

我能问问你做什么工作吗？

在超市遇到的人 - SpeakingMax英语口语达人

This particular website has this free nutrient analysis On the website people may choose to get involved in and there may be charges for those things, I don't really know, but there may be and then they may ask you for identifying information, but it's your option to do that.

网站的营养分析服务,在该网站,人们可以选择使用其他服务,当然,那些可能是收费的,我不是很确定,可能有收费服务,并要求验证个人信息,但这由你自己选择

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

You could say, "May I ask a question?"

你可以说，“我能问你一个问题吗？”

I want to 课堂 - SpeakingMax英语口语达人

Like I mentioned, you can also use "I want to" to ask if you may do something indirectly.

就像我之前说的，你可以用“I want to”句型间接地询问你是否可以做某些事。

I want to 课堂 - SpeakingMax英语口语达人