1 There are twelve months in a year.
2 Lan's sister isn't more intelligent than her.
3 He takes care of sick people.
4 Are you interested in listening to music ?
Cấu trúc : S + is/am/are + V-ing
5 What does your mother do ?
6 Our summer vacation lasts two months.
7 Don't forget to write a letter to me.
8 American students have more vacations than Vietnamese ones.
9 I spend about two hours each day doing my homework.
Cấu trúc : S + spend + khoảng thời gian + V-ing
10 Hoa studies hard.