`1`. Did ;

`2`. Did / go

`3`. Went

`4`. Did not help

`5`. Weren't

`6`. Did / design

`7.` Did not crash

`8`. Did not take off

`9`. Did you phone

`10`. Did not drink

`=>`S + did not + V (nguyên mẫu)

Did + S + V (nguyên thể)?

WH-word + did + S + (not) + V (nguyên mẫu)?

S + V2/ed +…

1. did

2. Did, go

3. visited

4. didn't help

5. weren't 

6. did, design

7. didn't crash

8. took off

9. Did, phone

10. didn't drink 

Cấu trúc thì quá khứ đơn:

*Động từ thường:

(+) S + V_ed/ V2

(- ) S + didn't+ V_inf

(? ) Did + S + V_inf?

- Yes, S + did

- No, S + didn't

*Động từ tobe:

(+) S + was/ were + ...

(- ) S + was/ were + not + ...

(? ) Was/ Were + S + ...

- Yes, S + was/ were

- No, S + was/ were + not