`-` When + S + Ved / V2 , S + had + V3 / PII

`-` By the time + S + Ved / V2 , S + had + V3 / PII

`-` Before + S + Ved / V2 , S + had + V3 / PII

`-` After + S + had + V3 / PII , S + Ved / V2

`1.1`.When we arrived , David had gone home

`1.2`.After David had gone home , we arrived

`2`.After we had had snack , we had a look around the shops

`3`.Before we took a look around the shops , we had had lunch

`4`.When we got out of the office , the light had gone out

`5`.By the time we started our work , she had explained everything clearly

`6`.Before my mother came home , my father had watered all the plants in the garden

`7`.Before I went to the zoo last year , I had never seen a real tiger before

`\text{# Kirigiri}`

$*OwO:$

- Kết hợp thì quá khứ đơn và thì quá khứ hoàn thành  để diễn tả một hành động xảy ra trước một hành động khác trong quá khứ.

  + Hành động xảy ra trước dùng thì quá khứ hoàn thành: S + had + V (Pii).

  + Hành động xảy ra sau dùng thì quá khứ đơn: S + V (-ed/ bất quy tắc).

- Câu $1, 4:$ When + S + V (-ed/ bất quy tắc), S + had + V (Pii): khi ... thì đã làm gì xong rồi.

- Câu $1, 2:$ After + S + had + V (Pii), S + V (-ed/ bất quy tắc): sau đi đã làm gì xong rồi thì mới ...

- Câu $3, 6, 7:$ Before + S + V (-ed/ bất quy tắc), S + had + V (Pii): trước khi làm gì thì đã làm điều gì khác xong rồi.

$---$

$1.$ $...$

When we arrived, David had gone home.

After David had gone home, we arrived.

$2.$ After we had had a snack, he had a look around the shops.

$3.$ Before we took a look around the shops, we had had lunch.

$4.$ When we got out of the office, the light had gone out.

$5.$ By the time we started our work, she had explained everything clearly.

- By the time + S + V (-ed/ bất quy tắc), S + had + V (Pii): khi làm gì thì đã làm điều gì khác xong rồi.

$6.$ Before my mother came home, my father had watered all the plants in the garden.

$7.$ Before I went to the zoo last year, I had never seen a real tiger before.