`3.` bigger

`4.` biggest

`5.` biggest

`6.` longest

`7.` highest

`8.` tallest

`9.` biggest

`10.` taller

`11.` hottest

`12.` longest

`13.` smallest

`14.` largest

`15.` best

`16.` wettest

`17.` hottest

`18.` largest

`19.` smaller

`20.` highest

*Có "the" `=>` Dùng cấu trúc So sánh nhất:

Short Adj : S + be + the + adj + est + in/of/...

Long Adj : S + be + the + most + adj + in/of/...

*Có "than" `=>` Dùng cấu trúc So sánh hơn:

Short Adj : S1 + be + adj + er + than + S2 + (be).

Long Adj : S1 + be + more + adj + than + S2 + (be).

3. Mexcico City is bigger than Tokyo. ( dùng so sánh vì có than)

4.Ho Chi Minh is the biggest city in Viet Nam. (dùng so sánh nhất )

5. China has the biggest population in the world . ( dùng so sánh nhất )

6. The Nile River is the longest river in the world . ( dùng so sánh nhất )

7. Fansipan is the highest mountain in Viet Nam. ( dùng so sánh nhất )

8. Buri Khalifa in Dubai is the world's tallest buiding. ( dùng so sánh nhất )

9. Russia is the biggest country in the world .( dùng so sánh nhất )

10. Petronas Twin Towers in Kuala Lumpur is taller than Sears Tower in Chicago. ( dùng so sánh vì có than)

11. It's the hottest desert in the world . ( dùng so sánh nhất )

12. The Mekong is the longest river in Viet Nam . ( dùng so sánh nhất )

13. Vatican is the smallest country in Vietnam .( dùng so sánh nhất )

14. Ho Chi Minh City is the lagest city in Viet Nam . ( dùng so sánh nhất )

15. The boat trip was the goodest experience of may life . ( dùng so sánh nhất )

16. Bangladesh is the wetest  of three countries : Viet Nam , England and Bangladesh. ( dùng so sánh nhất )

17. The Sahara is the world's hottest desert . ( dùng so sánh nhất )

18. Loch Lomond in Scotland is the largest fresh water lake in Great Britain . ( dùng so sánh nhất )

19. Lake Erie is smaller than Lake Huron . ( dùng so sánh vì có than)

20. Mount Everest is 8,848 metres highest . ( dùng so sánh nhất )

( xin lũi vì làm hơi lâu ạ )