Bài 1:

cheap - cheaper

cold - colder

thin - thinner

good - better

fast - faster

big - bigger

high - higher

long - longer

pretty - prettier

heavy - heavier

narrow - narrower 

old - older

near - nearer

bad - worse

fat - fatter

ugly - more ugly

clever - cleverer

close - more close

safe - safer

far - farther

large - larger

noisy - noisier

Bài 2:

1. more beautiful

2. more expensive

3. more dangerous

4. more confortable

5. more convenient

6. more important

7. more exciting

8. more popular

9. more beautiful

10. more difficult

11. more inconvenient

12. more modern

13. more historic

14. more terrible

15. more polluted

Chúc bạn học tốt !!!

`1`

`\text{cheap - cheaper}`

`\text{cold - colder}`

`\text{thin - thinner}`

`\text{good - better}`

`\text{fast - faster}`

`\text{big - bigger}`

`\text{high - higher}`

`\text{long - longer}`

`\text{pretty - prettier}`

`\text{heavy - heavier}`

`\text{narrow - narrower}`

`\text{old - older}`

`\text{near - nearer}`

`\text{bad - worse}`

`\text{fat - fatter}`

`\text{ugly - uglier}`

`\text{clever - cleverer}`

`\text{close - more close}`

`\text{safe - safer}`

`\text{far - farther}`

`\text{large - larger}`

`\text{noisy - noisier}`

`2`

`\text{1. more beautiful}`

`\text{2. more expensive}`

`\text{3. more dangerous}`

`\text{4. more confortable}`

`\text{5. more convenient}`

`\text{6. more important}`

`\text{7. more exciting}`

`\text{8. more popular}`

`\text{9. more beautiful}`

`\text{10. more difficult}`

`\text{11. more inconvenient}`

`\text{12. more modern}`

`\text{13. more historic}`

`\text{14. more terrible}`

`\text{15. more polluted}`

`\text{16. more crowded}`

`\text{17. more boring}`