`6`. My sister doesn't mind doing a lot of homework in the evenings. 

`->` mind + Ving: phiền, in the evenings: vào buổi tối

`7`. How long have you worked in this factory?

`->` How long + have/has + S + Vpp ?

`8`. Has Miss Mai been a formal teacher since you studied in this school?

`->` Hiện tại hoàn thành + since + quá khứ đơn 

`9`. There is a tradition that adults give children lucky money on New Year's days.

`->` give + SO + ST, that + S + V

`10`. There is a custom of eating breakfast at home together with my family.

`->` of + Ving. Có một phong tục ăn sáng ở nhà cùng gia đình tôi.

6 My sister doesn't mind doing a lot of homework evenings.

_ (not) mind + Ving 

7 How long have you worked in this factory ?

_ thì hiện tại hoàn thành : S+ have/has + PII

8 Has Miss Mai been  formal school since you studied in this school? 

_ Hiện tại hoàn thành + Since + quá khứ đơn

9 There is a tradition that adults give children lucky money on New Year's days.

_ give + smb + smt : đưa cho ai thứ gì 

10 There is a custom of eating breakfast at home together in my family.

_ of (giới từ) + VIng 

_ Dịch : Có một phong tục ăn sáng ở nhà cùng nhau trong gia đình tôi.