- long → longer → the longest

- fast → faster → the fastest.

- small → smaller → the smallest

- happy → happier → the happiest

- short → shorter → the shortest

- old → older → the oldest

- good → better → the best

- hard → harder → the hardest

- noisy → noisier → the noisiest

- young → younger → the youngest

- heavy → heavier → the heaviest

- strong → stronger → the strongest

- near → nearer → the nearest

- expensive → more expensive → the most expensive

- fat → fatter → the fattest

- busy → busier → the busiest

- long (bơn trơn á)

- cold → colder → the coldest

- big → bigger → the biggest

- left → more left → the most left

- late → later → the latest

- full → fuller → the fullest

- wide → wider → the widest

- easy → easier → the easiest

- tall → taller → the tallest

-cleaver → cleverer → the cleverest

- crowded → more crowded → the most crowded

- difficult → more difficult → the most difficult

- spicy → more spicy → the most spicy

- a lot of →  

- a little → less → the least

- polite → more polite → the most polite

- friendly → more friendly → the most friendly

- delicious → more delicious → the most delicious

- bad → worse → the worst

- many/ much → more → the most

Đáp án:

`- long longer longest`

- fast faster fastest

- small smaller smallest

- happy happier happiest

- short shorter shortest

- old older oldest

- good better best 

- hard harder hardest 

- noisy noisier noisiest 

- young younger youngest

- heavy heavier heaviest

- strong stronger strongest

`- expensive more expensive most expensive`

- fat fatter fattest

- busy busier busiest 

- long longer longest

- cold colder coldest 

- big bigger biggest

`- late later latest`

- wide. wider widest

- easy easier easiest

`- tall taller tallest`

-cleaver cleverer cleverest

- difficult more difficult most difficult

- polite more polite most polite

- friendly friendlier friendliest

`- delicious more delicious most delicious`

. - bad worse worst 

#AC