`1` Social network has been used for many purposes these days by teenagers

`2` I suggest that energy saving appliances should be used instead of ordinary ones to save energy

`3` If they were strong enough , they could lift the heavy door

`4`  It was such an old table that I couldn't keep

`5` She invited me to have lunch with her

`6` A heavy shower made them unable to fisnish their game of tennis

`7` Thay wanted to climb the mountain in spite of its danger

`-` CT :

S + has/have + V-II

`->` Bị động : S + has/have + been + V-II

Why don't we + V-inf +...?

S + suggested + that + S + should + V-inf 

`->` Bị động S + suggested + that + S + should + be + V-II

Câu đk loại 2 :  If + S + V-qk , S + would/could/... + V-inf ...

S+ tobe + such + a/an adj /N+ that + S + V

S + invited + sb + to V

S + make + sb/sth + adj

Because of + V-ing/N/N phrase 

In spite of + V-ing/N/N phrase 

$baoyen.$

1. Social network has been used for many purposes by teenagers these days.

S + has/have+  been + V3/ed: bị động - thì HTHT 

2. I suggested that energy-saving appliances should be used instead of ordinary ones to save energy.

S + suggested + (that) + S + (should) + V1: đề nghị 

S +  should be + V3/ed: bị động 

3. If they were strong, they could lift the heavy door.

If 2: If + QKĐ, S + would / could + V1 

4. It was such an old table that we could keep it.

S + be +such + (a/an) + ADJ + N + that + clause: quá ... đến nỗi 

5. She invited me to have lunch with her.

S + invited + O + to V: mời 

6. A heavy shower prevented them from finishing their game of tennis.

prevent sb from sth: ngăn chặn ai làm gì 

7. They wanted to climb the mountain in spite of its danger.

In spite of / Despite + N / NP / Ving, clause: mặc dù 

tính từ sở hữu + N 

`color{orange}{~MiaMB~}`