You must ask one or other of your parents.

你必须问你的父亲或母亲。

《牛津词典》

You must ask her for some help in our trouble.

你一定请她在我们困难的时候帮帮忙。

youdao

You must ask permission for all major expenditure.

一切重大开支均须报请批准。

《牛津词典》

"If senators refuse to debate about a profound crisis affecting every single citizen, the nation must ask 'What do you fear?' ,'And whose voice do you speak and whose interest do you vote?" Republican Mitch McConnell of Kentucky disagreed, saying the bill will make soaring health care costs go even higher, and place a greater burden on average Americans.

VOA: standard.2009.11.23

He replied, "Jacob." Said he, "Your name shall no longer be Jacob, but Israel, for you have striven with God and men, and have prevailed." Jacob asked, "Pray tell me your name." But he said, "You must not ask my name!"

答，“我名叫雅各，“那人说，“你的名不要再叫雅各,要叫以色列，因为你与神与人较力都得了胜，“雅各问,“请将你的名告诉我，“那人却说，“何必问我的名，“

耶鲁公开课 - 旧约导论课程节选

In order to attend, you must know the date and the time. You can ask your friend, "When is your wedding?"

为了能够出席，你必须知道具体的日期和时间，你可以问你的朋友，“When is your wedding？”

When 课堂 - SpeakingMax英语口语达人

Instead, you must ask about food intake and determine if there has been significant weight change.

BBC: Viewpoint: Why malnutrition matters

These are the four indispensable questions you must ask yourself before jumping in headfirst.

FORBES: 4 Questions You Must Ask Yourself Before Starting a Business - How to Hone in on a Winning Idea

So the question you must ask yourself is: how many customers or potential customers can I afford to lose?

FORBES: Airing Political Views May Cause Self-Employed to Lose Hard-Earned Clientele