2.mexico city is smaller than tokyo ,but new york is the smallest

3.new york is wetter than mexico city , but tokyo is the wettest

4.new york is drier than tokyo, but mexico city is the driest

5.tokyo is cheaper than new york, but mexico city is the cheapest

6.tokyo is more expensive than mexico city , but new york is the most expensive

7.mexico city is hotter than new york, but tokyo is the hottest

8.tokyo is colder than mexico city, but new york is the coldest

9.new york is cleaner than mexico city, but tokyo is the cleanest

10.new york is more polluted than tokyo , but mexico city is the most polluted

cấu trúc : 

so sánh hơn : s1 + to be / trợ động từ + adj 1 âm tiết + er / adj 2 âm tiết_y => ier / more adj 2 âm tiết + than + s2

so sánh hơn nhất : s1 + to be / trợ động từ + the +  adj 1 âm tiết + est / adj 2 âm tiết_y => iest / most adj 2 âm tiết + o

$*OwO:$ Dạng so sánh hơn và so sánh nhất của tính từ:

$-$ So sánh hơn với tính từ ngắn: $S_{1}$ + tobe + adj + "er" + $($than $S_{2}$$)$.

 $+$ Bỏ "y" thay bằng "i" rồi thêm "er" với những tính từ có đuôi "y".

 $+$ Gấp đôi chữ cái ở cuối đối với những tính từ có cấu tạo "Phụ âm - nguyên âm - phụ âm".

$-$ So sánh hơn với tính từ dài: $S_{1}$ + tobe + more + adj + $($than $S_{2}$$)$.

- So sánh nhất với tính từ ngắn: S + tobe + the + adj + “est” + $($N$)$.

- So sánh nhất với tính từ dài: S + tobe + the + most + adj + $($N$)$.

$---$

$2.$ Mexico city is smaller than Tokyo, but New York is the smallest.

$3.$ New York is wetter than Mexico City, but Tokyo is the wettest.

$4.$ New York is drier than Tokyo, but Mexico City is the driest.

$5.$ Tokyo is cheaper than New York, but Mexico City is the cheapest.

$6.$ Tokyo is more expensive than Mexico City, but new York is the most expensive.

$7.$ Mexico City is hotter than New York, but Tokyo is the hottest.

$8.$ Tokyo is colder than Mexico City, but New York is the coldest.

$9.$ New York is cleaner than Mexico City, but Tokyo is the cleanest.

$10.$ New York is more polluted than Tokyo, but Mexico City is the most polluted.