Dưới đây là cách viết lại các câu mà không làm thay đổi nghĩa:

1. My sister had gone home before my father arrived.
→ After my father arrived, my sister had gone home.

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

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

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

Hy vọng giúp ích cho bạn!