my sister is staying at the hostel school
→ thì HTTD : S + be + V-ing
 her new school is smaller than her old school 
→ so sánh hơn : 
→ 1 âm tiết : adj + er + than
→ 2 âm tiết : more + adj + than 
3 how far is it from your house to the post office ?
→ cấu trúc how far is is from + N1 + to the + N2 ( chỉ địa điểm )
4 how diffrent is your brother from you ? 
→ ta có cụm từ diffrent from
→ cấu trúc : S + be + diffrent from + O