: Chia dạng đúng của động từ trong ngoặc ở thì quá khứ đơn và quá khứ hoàn thành. 1. They (go) home after they (finish) their study. 2. Yesterday when I (arrive) to the party, they (already go) home. 3. After the guests (leave) , she (go) back into the living-room and (switch) off the light. 4. On arrival at home I (find) that she (just leave) just a few minutes before. 5. Before he (go) to bed, he (do) his homework. 6. When they (get to the place, the man (die) 7. He (do) nothing before he (see) me. 8. He (thank) me for what I (do) for him. 9. I (be) sorry that I (hurt) him. 10. After they (go) , I (sit) down and (rest)

*Note: Sau after dùng QKHT

Trước before dùng QKHT

Hành động xảy ra trước dùng QKHT

Hành động xảy ra sau dùng QKĐ

1. They (go) home after they (finish) their study

→ went/ had finished

2. Yesterday when I (arrive) to the party, they (already go) home.

→ arrived/ had already gone

3. After the guests (leave) , she (go) back into the living-room and (switch) off the light.

→ had left/ went/switched

4. On arrival at home I (find) that she (just leave) just a few minutes before.

→ found/ had just left

5. Before he (go) to bed, he (do) his homework.

→ went/had done

6. When they (get) to the place, the man (die)

→ got/ had died

7. He (do) nothing before he (see) me.

→ had done/ saw

8. He (thank) me for what I (do) for him.

→ thanked/ had done

9. I (be) sorry that I (hurt) him.

→ was/had hurt

10. After they (go) , I (sit) down and (rest)

→ had gone/ sat/rested