18. The summer this year is (dry) as ever. 19. It is (difficult) rule of all. 20. This pen writes (good) than my previous 1. 21. This athlete is (strong) than his competitor. 22. This pupil is (clever) in the class. 23. This is (old) castle in Britain. 24. Health is (important) than money. 25. This path is (narrow) than the parallel 1. 26. This actor is (famous) actor from Spain. 27. Oranges are (expensive) than lemons.

`18`. the driest

`19`. the most difficult

`20`. better

`21`. stronger

`22`. the cleverest

`23`. the oldest

`24`. more important

`25`. narrower

`26`. the most famous

`27`. more expensive

`--------------------`

So sánh nhất với tính từ ngắn : S + V + the + adj/adv + est + N + ...

So sánh nhất với tính từ dài : S + V + the + most + adj/adv + N + ...

So sánh hơn với tính từ dài : S1 + V + more  + adj/ adv  + than + S2

So sánh hơn với tính từ ngắn : S1 + V + adj/adv + er + than + S2