13.The Japanese cars are the most expensive in the world.

->S + be + the + most + long adj + place.

14.That exercise is not easier than this one.

->S + be + short adj + er + than + S.

15.Jack doesn't drive more carefully than he.

->S + V + more + long adv + than + S .

16.He can plays the best in the group.

->S + V + the + irregular adjectives ( tính từ bất quy tắc) + place.

17.This hotel is the most comfortable in th city.

->S + be + most + long adj + place.

18.The Pacific Ocean is the largest ocean in the world.

->S + be + the + short adj + er + place.

Chúc bạn học tốt.