I must not stay here and do nothing.

我不能待在这儿并且什么也不做。

youdao

I must say we can do nothing (There is nothing we can do) in this matter.

我必须告诉你在这件事上我们无能为力。

youdao

I must go home now. I have nothing else to do.

我现在必须回家了，我没别的事做了。

youdao

I must go home now. I have nothing else to do.

我现在必须回家了，我没别的事做了。

youdao