`3`. When are there many festivals in Viet Nam?

`-` When...?: Khi nào?

`4`. What festival do people celebrate in Lai Chau?

`-` What...?: Cái gì?

`5`. What do the Hmong boys like doing in spring?

`-` What...?: Cái gì?

`-` like + V-ing: thích làm gì

`6`. How often does he go herding the buffalos with other boys in his village.

`-` How often + do/does + S + V-inf?: bao lâu một lần?

`7`. When does Hoa Bạn blossom?

`-` When...?: Khi nào? 

Công thức thì HTĐ (V: tobe)

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

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

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):

- When: khi nào 

- What: cái gì 

- How often: tần suất 

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3. When are there many festivals in Viet Nam?

4. What festival do people celebrate in Lai Chau?

5. What do The Hmong boys like doing in spring?

6. How often does he go herding the buffaloes with other boys in his village?

7. When does Hoa Ban blossom?

`color{orange}{~LeAiFuRuiHuiBao~}`