1. had sat - saw (sit - sat - sat: ngồi ; see - saw - seen: xem)

2. went - had shined

3. had gone - had

4. learnt - had had

5. had walked - began (begin - began - begun: bắt đầu)

6. had had - repaired

7. had started - played

8. had eaten - talked (eat - ate - eaten: ăn)

9. had dropped - washed up

10. wrote - had rung (write - wrote - written: viết; ring - rang - rung: đổ chuông)

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*Sự liên quan giữa thì quá khứ đơn và thì quá khứ hoàn thành:

- Hành động xảy ra trước chia thì quá khứ hoàn thành:

( + ) S + had + Vpp

( - ) S + had not/ hadn't + Vpp

( ? ) (WH-words) + had + S + Vpp?

- Hành động xảy ra sau chia thì quá khứ đơn:

( + ) S + Ved/ V2

( - ) S + did not/ didn't + Vinf

( ? ) Did + S + Vinf?

*Hay có các cấu trúc cụ thể như:

When + QKĐ, QKHT

While + QKĐ, QKHT

By the time + QKĐ, QKHT

After + QKHT, QKĐ