There are four books on the table.(对划线部分提问) 【How many 】 books 【are there】on the table?
We should return the books to the library on time.（改成同义句） We should 【 give back】 the books to the library on time.

祝你学习进步,更上一层楼! (*^__^*)
不明白的再问哟,请及时采纳,多谢!