$\text{1. We had a party last Sunday}$

$\text{⇒ We didn't have a party last Sunday}$

$\text{⇒ Did they have a party last Sunday?}$

$\text{2. My grandparents visited Ho Chi Minh City last year.}$

$\text{⇒ My grandparents didn't visit Ho Chi Minh City last year}$

$\text{⇒ Did your grandparents visit Ho Chi Minh City last year?}$

$\text{3. Lan and Hoa sang and danced at the party}$

$\text{⇒ Lan and Hoa didn't sing and dance at the party}$

$\text{⇒ Did Lan and Hoa sing and dance at the party?}$

$\text{4. My father got up early}$

$\text{⇒ My father didn't get up early}$

$\text{⇒ Did your father get up early?}$

$\text{5. She joined a sports festival at Hue}$

$\text{⇒ She didn't join a sports festival at Hue}$

$\text{⇒ Did she join a sports festival at Hue?}$

`text{1. he had a party last sunday}`

`text{(-) he didn't have a party last sunday}`

`text{(?) did he have a party last sunday?}`

`text{2. my grandparents visited Ho Chi Minh city last year}`

`text{(-) my grandparents didn't visit Ho Chi Minh city last year}`

`text{(?) did your grandparents visit Ho Chi Minh city last year?}`

`text{3. Lan and Hoa sang and danced at the party}`

`text{(-) Lan and Hoa didn't sing and dance at the party}`

`text{(?) Did Lan and Hoa sing and dance at the party?}`

`text{4. My father got up early}`

`text{(-) my father didn't get up early}`

`text{(?) did your father get up early?}`

`text{5. she joined a sport festival in Hue}`

`text{(-) she didn't join a sport festival in Hue}`

`text{(?) did she join a sport festival in Hue?}`

                                                                                    

`text{công thức:}`

`text{(+) S + V2/ed + O}`

`text{(-) S + didn't/didnot + Vbare + O}`

`text{(?) Did + S + Vbare + O?}`