You must return it to the library on time.（同义句）
问题描述：
You must return it to the library on time.（同义句）
答
You must put it back to the library on time
答
you have to bring it back to the library before it is too late
答
你必须及时的把它还给图书馆
答
You must give it back to the library on time.（
答
You must return it to the library on time.=
You must give it back to the library on time.
return = give back 归还,送回.