Công thức thì TLG

(+) S + am/is/are + going to + V1 

(-) S + am/is/are + not +  going to + V1 

(?) Am/Is/Are + S + going to + V1?

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

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1. Last summer holiday, I stayed with my grandparents in the countryside.

2. Next summer holiday, I am going to stay with my grandparents in the countryside.

`color{orange}{~LeAiFuRuiHuiBao~}`

`1.` Last summer holiday, I went to Sam Son beach with my family.

`+)` QKĐ: S + V-ed/V2 + O

`2.` Next summer holiday, I am going to visit Phu Quoc island.

`+)` TLG - be going to: S + tobe + going to + V-inf + O

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`@yt2704`