a, Mary / tall / her brother
=>Mary is taller than her brother
b. A lemon / not sweet / an orange
=> A lemon isn't sweeter than an orange.
c. A donkey / not big / a horse
=>A donkey isn't bigger than a horse.
d. This dress / pretty / that one
=>This dress is prettier than that one
e, The blue house / not big / the red house
=>The blue house isn't bigger than the red house.
2. Comparative
a, A rose / beautiful / a weed
=>A rose is more beautiful than a weed.
b,A dog / intelligent / a chicken
=>A dog is more intelligent than a chicken
c. Ba / friendly / Nam
=>Ba is more friendly than Nam
d. Your house / far / from school / my house
=>Your house is farrer from school than my house.
e. A horse / strong / a person
=>A house is stronger than a person.
3. Superlative
a. The Nile / long / river / in the world
=>The Nile is the longest river in the world.
b. Lan / tall / student / in my class
=> Lan is the tallest student in my class.
c. Russia / big / country in the world
=>Russia is the largest country in the world.
d. Australia / small / continent in the world
=>Australia is smallest continent in the world.
e. That / high / mountain in the world
=>That is the highest mountain in the world.