`1`. came - had been prepared.

`2`. began - was

`3`. went - had - had

`4`. had left

`5`. had revised

`6`. hadn't paid

`7`. had had

`8`. hadn't used

`9`. had never been

`10`. did he do

`11`. went

`12`. destroyed

`13`. had never heard

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*Sự hoà hợp các thì (Quá khứ - Quá khứ)

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

( + ) S + had + Vpp + ...

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

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

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

( + ) S + Ved/ V2 + ...

( - ) S + did not/ didn't + V-inf + ...

( ? ) (WH-word) + did + S + V-inf + ...?

* Các câu trúc 

* Qúa khứ đơn ( QKĐ)

+) S + V( ed/ cột 2) 

-) S + didn't + V 

?) Did + S + V?

- `DHNB`: when , before, ......

* Qúa khứ hoàn thành( QKHT)

+) S + had + V-pp

-) S + hadn't + V-pp

?) Had + S + V ?

- `DHNB`: after, never ....

`1.` came- had been prepared 

- By the time + QKĐ, QKHT 

- already: thì HTHT, our meals bị động `->` Bị dộng của QKHT 

-S + had been + V-pp

`2.` began - was 

- QKĐ + when + QKĐ 

`3.` went - had had 

- Before + QKĐ, QKHT

`4.` had left 

- When + QKĐ, QKHT

`5.` had revised 

- QKĐ after + QKHT 

`6.` had paid 

`7.` had had 

- QKHT + when + QKĐ 

`8.` hadn't used

`9.` had never been 

`10.` did he do 

`11.` went 

`12.` detroyed 

`13.` had never heard