IV)

1) more comfortable

2) larger 

3) more important

4) heavier

5) more difficult

6) longer

7) more intelligent

8) better

9) worse 

10) prettier

11) stronger

12) more beautiful

V)

1) longer

2) bigger

3) more intelligent

4) faster

5) heavier

6) colder

7) more difficult

8) older

9) bigger

10) higher

VI)

1) My father is older than uncle Hung

2) She is taller than her mother

3) Winter is colder than spring

4) Ha Noi Opera House is bigger than Hai Phong Opera House

5) A house in the city center is more expensive than the house in suburb

6) My neighbourhood is more crowded than your neighbourhood

7) Travelling by train is more comfortable than travlling by coach

8) Mai is younger than her sister 

9) Hue is more historic than Hoi An]

10) Living in tha country is more peaceful than living in the city 

XONG RỒI, CHÚC EM HỌC TỐT

IV

1. More comfortable ( nó là tính từ dài nên phải thêm more)

2. Larger ( Tính từ ngắn phải thêm er)

3. More important ( tính từ dài )

4. Heavier ( tính từ dài nhưng đuôi y nên thêm er)

5. More difficult 

6. Larger

7. More intelligent 

8. Better 

9. Worse 

10. Prettier

11. More beautiful 

V

1. longer 

2. Bigger

VII

1. Bigger 

2 More interesting 

3. Cheaper 

4. Noisier

5. More expensive 

6. More boring 

7. Busier 

8. More modern 

( Các câu khác cũng có cách giải thích tương tự )