=>
1. the longest
2. the most interesting
3. more frightening
4. the most boring/more boring
5. narrower
6. more polite
7. more expensive
8. tall
9. more exciting
10. less
11. the hottest
So sánh hơn :
Tính từ ngắn : adj-er than
Tính từ dài : more adj than
So sánh nhất :
Tính từ ngắn : the adj-est
Tính từ dài : the most adj
So sánh bằng : as adj as

1. longest

long - longer - the longest

2. the most interesting

interesting - more interesting - the most interesting

3. more frightening

frightening- more frightening- the most frightening

4. the most boring - more boring 

5. narrower

narrow - narrower - the narrowest

6. more polite/ politer

7. more expensive

expensive - more expensive - the most expensive

8. tall

9. more exciting

exciting - more exciting - the most exciting

10. less

little - less - the least

11. the hottest

hot - hotter - the hottest

Cấu trúc:

+ So sánh hơn: S + be + adj(ngắn)-er/more adj(dài) + than + S

+ So sánh nhất: S + be + the adj(ngắn)-est/most adj(dài)....

+ So sánh ngang bằng: S + be + as + adj + as + S

@Bulletproof