15.    This book is (difficult) than that one.
…………………………………
16.    My jeans are (expensive) than yours.
         ………………………………….
17.    Climbing is (dangerous) than swimming.
  …………………………………
18.    I feel (happy) today than yesterday.
  ………………………………….
19.    She smiled (happy) than before. 
  ………………………………….
20.    This exercise is (easy) of all. 
  ………………………………….
21.    My class is (cool) of all the classes at my school. 
  ………………………………….
22.    This flower is (beautiful) in the garden 
  ………………………………….
23.    This is  (interesting) book in the library.
  ………………………………….
    24.    I think the cow is (useful) of all animals.
…………………………………
25.    Summer is (hot) season of the year.
…………………………………
26.    There is nothing (exciting) than taking trips.       …………………………………
27.    This is (exciting) film I have watched
…………………………………
28.    Gold is (valuable) than silver.
…………………………………
29.    Nothing is (important) than health.
…………………………………
30.    This book is (difficult) than that one.
…………………………………
THÊM TÍNH TỪ DÀI HOẶC NGẮN
TỪ NGẮN: THÊM THE .....EST
TỪ DÀI: THÊM THE MOST .......... ĐỘNG TỪ NGUYÊN THỂ