Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

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Các từ để hỏi (Wh):

- What : cái gì 

- How often: tần suất 

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49. What does Susan enjoy playing?

50. How often does your family visit the countryside?

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`49`. What does Susan enjoy playing?

`-` What?: Cái gì?

`-` HTĐ: Do/Does + S + V-inf?

`50`. How often does your family visit the countryside?

`-` How often?: bao lâu một lần?

`-` HTĐ: Do/Does + S + V-inf?