**Bài 4: Gạch chân dưới dạng đúng của động từ**

1. By the time I arrived at the party, everyone **had left**.
2. They **had already eaten** dinner when I got home.
3. She **had been studying** French for two years before she moved to Paris.
4. By the time we got to the station, the train **had left**.
5. When I woke up this morning, my parents **had already gone** to work.
6. By the time she arrived at the airport, the plane **had taken off**.
7. They **had already finished** their homework when the teacher checked it.
8. Before he moved to New York, he **had lived** in Chicago for five years.
9. Sarah **had not eaten** sushi before she visited Japan.
10. By the time the concert started, the band **had performed** three songs.

**Bài 5: Gạch chân dưới dạng đúng của động từ**

1. When we **reached/had reached** the station, the train **had left** already.
2. Did you **feel/had you felt** surprised when you **heard/had heard** the news?
3. It **was/had been** midnight and most of the shops **had just closed**.
4. Mary **didn't want/hadn't wanted** to see the film because she **had seen** it before.
5. John was delighted when he **found out/had found out** that he **had passed** the exam.
6. My violin teacher **got/had got** angry because I **hadn't practised**.
7. She **was/had been** tired because she **had gone** to bed late the night before.
8. By the time Jack **decided/had decided** to apply for the job, the position **had been filled**.

**Bài 6: Viết lại câu sao cho nghĩa không đổi sử dụng từ gợi ý cho sẵn**

1. David had gone home before we arrived.
→ After David had gone home, we arrived.

2. We had lunch then we took a look around the shops.
→ Before we took a look around the shops, we had lunch.

3. The light had gone out before we got out of the office.
→ When we got out of the office, the light had gone out.

4. After she had explained everything clearly, we started our work.
→ By the time she had explained everything clearly, we started our work.

5. My father had watered all the plants in the garden by the time my mother came home.
→ Before my mother came home, my father had watered all the plants in the garden.