27. Collecting coins from foreign countries is George’s interest.

`=>` George is interested in collecting coins from foreign countries

28. I often went to the cinema at weekends.

`=>`  I used to go to the cinema at weekends.

29. Does Phong’s school have forty classrooms?

`=>` Are there forty classrooms in Phong's school ?

30. “Please do not litter as you are walking along the coast”, the guard said to us.

`=>` The guard told us not to litter as we were walking along the coast.

31. You can’t register for a course abroad if you don’t have a passport.

`=>` Unless you have a passport, you can’t register for a course abroad.

32. “Why don’t we visit the Royal Citadel first?” Quang said.

`=>` Quang suggested that we should visit the Royal Citadel first. 

27. Interested in collecting coins from foreign countries 

Be interested in doing sth: thích làm gì 

28. to go to the cinema at weekends 

used to: đã từng

29. there forty classrooms in Phong's school?

30. us not to litter as we were walking along the coast 

31. you have a passport, you can't register for a course abroad 

Unless= If not, nên vế sau phải phủ định mới hợp nghĩa 

32. visiting the Royal Citadel first 

suggest + doing sth. 

Chúc bạn học tốt.