`1` did he go 

`=>` Yesteday `-` Thì quá khứ đơn  : 

`(?)` Wh - question + did + S + V + O ? 

`2` are 

`=>` Thì hiện tại đơn : 

`(+)` S + is / are / am + O 

`(-)` S + is / are / am + not + O 

`(?)` Is / Are / Am + S + O ? 

`3` didn't buy 

`=>` Last summer `-` Thì quá khứ đơn : 

`(-)` S + didn't + V + O 

# Ríttttt 🍉 (ㆁωㆁ)

1. did he go 

yesterday → QKĐ

2. are

Câu giới thiệu → HTĐ

3. didn't buy

Last summer → QKĐ

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

Cấu trúc thì hiện tại đơn:

*Động từ thường:

(+) S + V_inf/ V-e,es

(- ) S + don't/ doesn't + V_inf

(? ) Do/ Does + S + V_inf?

- Yes, S + do/ does

- No, S + don't/ doesn't

*Động từ tobe:

(+) S + is/ am/ are + ...

(- ) S + is/ am/ are + not + ...

(? ) Is/ Am/ Are + S + ...

- Yes, S + is/ am/ are

- No, S + is/ am/ are + not