6/ How often do you study with a partner? 

`=>` I study with a partner twice a week.

7/ How often does Linda go to the cinema?

`=>` She goes to the cinema once a month.

8/ How often does your mother go shopping?

`=>` She goes shopping every day. 

9/ How often do you surf the Internet?

`=>` I surf the Internet once a week. 

`==>` Công thức hỏi về sự thường xuyên và các trạng từ chỉ tần suất.

- How often +do/does+S+`V_0`+O......? 

- S+V(V-s/V-es/V-0)+ cụm trạng từ chỉ tần suất.

* Cụm trạng từ chỉ tần suất: twice a week (2 lần 1 tuần), once a month (1 lần 1 tháng),....

$@Maruko-chan$ 

6. How often do you study with a partner ?

=>I study with a partner twice a week.

7. How often does Linda goes to the cinema ?

=> She goes to the cinema once a month.

8. How often does your mother go shopping?

=> She goes shopping every day. 

9. How often do you surf the Internet?

=>  I surf the Internet once a week.

*Công thức : 

he / she / it / N ( số ít ) + Vs;es 

I / You / We / They / N ( số nhiều ) + Vnt