Bài 3:

1. He didn't write a book.

Did he write a book?

2. She wasn't my boss.

Was she my boss?

3. They built a new house.

Did they build a new house?

4. I was at the concert last Sunday.

Was I at the concert last Sunday?

5. You bought clothes in this clothes shop.

You didn't buy clothes in this clothes shop.

6. They were born in Korea.

They weren't born in Korea.

7. He didn't swim in the lake.

Did he swim in the lake?

8. We were not at the gym last week.

Were we at the gym last week?

9. She went to her office by car.

Dis she go to her office by car?

10. He was a good boy.

Was he a good boy?

Bài 4:

1. C ("yesterday" -> QKĐ)

2. C ("last night" -> QKĐ)

3.  A (Bố tôi đã mệt khi tôi về đến nhà)

4. D (two days ago -> QKĐ)

5. C ("last year" -> QKĐ)

6. D ("a few days ago" -> QKĐ)

7. A (shut the window: đóng cửa sổ)

8. B (last week _> QKĐ)

9. C (last weekend _> QKĐ)

10. B (last night -> QKĐ)

11. D (enjoy là động từ thường nên cần trợ động từ "did" để chuyển sang bị động)

12. B (did sleep : một cách nhấn mạnh)

13. B (fly -flew - flown)

14. C (yesterday -> QKĐ)

Mình trình bày trong hình nhé >~<

#𝕄𝕪𝕪𝕟𝕙𝕙