№4 Make Tag questions: 1. Alan was looking for a new job. 2. You must study harder for your exams. 3. I called Sam yesterday. 4. They take the dog for a walk. 5. Miss Simpson is typing a letter. 6. The children weren’t watching a play. 7. They go to the restaurant every Sunday. 8. Tom has read this book four times already. 9. Sally hasn’t had lunch. 10. Boss will write some letters.

1. Alan was looking for a new job, wasn't he?
To form a tag question, we need to use the opposite form of the auxiliary verb used in the main clause. In this case, the auxiliary verb is "was", so the tag question will be "wasn't he?".

2. You must study harder for your exams, mustn't you?
The auxiliary verb "must" is used in the main clause, so the tag question will be "mustn't you?".

3. I called Sam yesterday, didn't I?
The main verb in the sentence is "called", so the tag question will be "didn't I?".

4. They take the dog for a walk, don't they?
The main verb in the sentence is "take", so the tag question will be "don't they?".

5. Miss Simpson is typing a letter, isn't she?
The auxiliary verb "is" is used in the main clause, so the tag question will be "isn't she?".

6. The children weren't watching a play, were they?
The auxiliary verb "were" is used in the main clause, so the tag question will be "were they?".

7. They go to the restaurant every Sunday, don't they?
The main verb in the sentence is "go", so the tag question will be "don't they?".

8. Tom has read this book four times already, hasn't he?
The auxiliary verb "has" is used in the main clause, so the tag question will be "hasn't he?".

9. Sally hasn't had lunch, has she?
The auxiliary verb "has" is used in the main clause, so the tag question will be "hasn't she?".

10. Boss will write some letters, won't he?
The main verb in the sentence is "will write", so the tag question will be "won't he?".