Hey Aayushi!

The question which you have asked seems a bit vague. It lacks the details stating the name of the English grammar book, the standard or class for which you are asking the back exercises of the English grammar book and also the name of the book(it's publication). Also, the books made available for students of various subjects are distinct based on the board in which the student is enrolled in or the school follows. Generally, it also depends on particular schools selection of a certain book for preparation.

Moreover, to solve the questions in the text book you are required to study the theory or explanation part provided in a particular chapter. After going through the explanation part, you will be able to solve it. And to check whether you have written the correct answer or not, you may check the last pages of the book or the last page of the particular chapter where answers are provided. Although, not all books contain the answer part.