你想自己变得更好，你必须走正道。

You wanna do better for yourself. You gotta go the right path.

youdao

如果你准备好了，明天你必须走。

You must go tomorrow if you are ready.

youdao

行路人，你必须走么？

Traveller, must you go?

youdao

I've got to tell you whether I went to the right or whether I went to the left.

我必须告诉你,我是向右走还是向左走的

耶鲁公开课 - 基础物理课程节选

but you have a prior engagement and you really must be going, you can say,

但是你已有约在先，你真的必须走了，你可以说，

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You can tell your partner that you must finish this project before you leave.

你可以告诉你的伙伴，你走之前必须完成这个项目。

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