didn't work / could attend
 

had broken

6,7 . mình không chắc lắm

was/ had eaten
 

x+(x+1)+(x+2)+....+19+20=20

Ta có: 19+20=39

=> x+(x+1)+(x+2)+....+19+20=20 ( vô lý )

=> K tồn tại x.

Làm bừa

After I had washed my clothes, I slept
 

Before I watched TV, I had done my homewwork

1. go

2. am reading

3. lives / lives

4. get up

5. is telling

No sooner had I watched TV than the phone rang

Alan hardly had prepared for dinner when her husband went home