$\text{@su}$

`1`, spent / had wanted 

`2`, had phoned / left

`3`, had turned on 

`4`, arrived / had already start

`5`, had came / fed 

`6`, sang / had played

`7`, watched / had gone

`8`, had made / phoned

`9`, was / had studied

`10`, had ridden / met

Bonus: 

- Thì QKĐ: S + V-ed + O

            S + didn't + Vbare + O

- Thì QKHT: S + had + (not) + P2 + ...

- QKĐ + after + QKHT

- QKHT + before + QKĐ

(Nếu sai đâu, mong chỉ giáo)

$\text{#BTS}$

`1`. Before Fred had spent his holiday in Italy he wanted to learn Italian.

`2`. Jill had phoned Dad at work before she left for her trip.

`3`. Susan turned on the radio after she had washed the dishes.

`4`. When she arrived the match had already started.

`5`. After the man had come home he fed the cat.

`6`. Before he sang a song he had played the guitar.

`7`. She watched a video after the children had gone to bed.

`8`. After Eric had made breakfast he phoned his friend.

`9`. I was very tired because I had studied too much.

`10`.They had ridden their bikes before they met their friends.

`→` Past perfect:

`(+)` S + had + VpII + ......

`(-)` S + hadn’t + VpII + .....

`(?)` Had + S + VpII ?

`→` Past simple:

`-` Với động từ tobe

`(+)` S + was/ were +…

`(-)` S + was/ were + not + .... 

`(?)` Was/ Were + S +…?

`-` Với động từ thường:

`(+)` S + V-ed +…

`(-)` S + did not + V(nguyên mẫu)

`(?)` Did + S + V(nguyên thể)?