`1.` In spite of being poor, the villagers live a happy and healthy way.

`->` In spite of + Noun/Noun Phr/V-ing, clause: mặc dù...nhưng...

`2.` Before he left the house, he had turned off all the lights and eletric devices.

`->` hành động xảy ra trước hành động khác trong quá khứ `->` thì QKHT

Before + S + Ved/V2, S + had + P2

`3.` When she was walking to school  yesterday, she saw an accident on the road.

`->` hành động đang xảy ra thì một hành động khác chen ngang `->` thì QKTD

When + S + was/were + V-ing, S + Ved/V2

`1` In spite of being quite poor , they live a happy and healthy way

`2` Before he left the house , he turned off all the lights and eletric devices

`3` When  she was walking to school  yesterday , she saw an accident on the road 

`-` CT :

Although + S + V ( mệnh đề )

S + V2/V-ed

When S + was/were + V-ing , S + V2/V-ed

$baoyen.$