1 used to go / was 

2. used to play/was

3. used to drive

4. What did you use to do/  used to go

5. used to live/ were /grown

6. didn't use to go

7. used to be

8.used to live

9. didn't use to have / used to have

Cấu trúc:

Khẳng định:S + used to +V

Phủ định :  S+ did not use to V

Nghi vấn (?)Did+S +use to V?

$\text{1.}$ to go - was 

$\text{2.}$ to play  - was 

$\text{3.}$ to drive 

$\text{4.}$ did you use to do - to go 

$\text{5.}$ to live - were - grown 

$\text{6.}$ didn't use to go 

$\text{7.}$ to be 

$\text{8.}$ to live 

$\text{9.}$ didn't use to have - to have

→ used to + V-inf : đã từng làm j 

→ did not (didn't) use to + V-inf : chưa từng làm j 

→ Did + S + use to + V-inf + O ? 

$#Keisha$