你务必在星期五之前归还这本书。

You are to return the book before Friday.

youdao

你会在星期五之前看完这本书吗？

Will you have finished reading the book by Friday?

youdao

你必须在星期五之前把这本书还给图书馆。

You must return this book to the library by Friday.

youdao

你必须在星期五之前把这本书还给图书馆。

You must return this book to the library by Friday.

youdao