1. The pyramid / ancient / of the three

-> the pyramid is one of the most acient of the three 

-> one of the most + N

2. This athiete / good / athlete in the world

-> this athiete is the best athelte in the word

-> so sánh nhất 

-> good -> better -> best

3. February / short / month / in the year 

February is the shortest month in the year

-> so sánh nhất

-> 1 âm tiêts : the + ADJ/ADV + -est

-> 2 âm tiết : the + most + ADJ/ADV

.5 The red apple / sweet / apple in the bowl

The red apple  is swetter than the apple in the bowl

-> so sánh hơn

-> 1 âm tiết : adj / adv + er + than 

-> 2 âm tiết : more + adj / adv + than

1. The pyramid is the most ancient of the three ( so sánh trong 3 cái --> dùng so sánh nhất)

2. This athlete is the best athlete in the world ( dấu hiệu: in the world --> dùng so sánh nhất)

3. February is the shortest month in the year. ( dấu hiệu: in the year (so sánh các tháng)--> dùng so sánh nhất)

5. The red apple is the sweetest apple in the bowl (dấu hiệu: in the bowl --> dùng so sánh nhất)