I'm not as old as my brother.
Not As + Adjective + As
This is another way to make comparisons. With this phrase, we do not need to change the form of the adjective. Also, we do not use than:
Today, it isn't as warm as yesterday.
Juice isn't as cheap as water at this cafe.
Canada isn't as big as Russia.
My computer isn't as nice as yours.
Compare the two kinds of comparisons:
Spaghetti is more delicious than soup.
Soup isn't as delicious as spaghetti.
Tokyo is bigger than Toronto.
Toronto isn't as big as Tokyo.
My father is older than my mother.
My mother isn't as old as my father.
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