Who is my mother? Hello.

China is bigger than France.

An adjective maintains the same sex number as the noun it modifies.

Adverb comparative degree:

She sang for me.

She came up to me.

Adverbs never cooperate (except for a few adverbs such as tout, grand grand ...)

Adjective superlative:

They are the super fortress of the school.

This is the happiest time in the world.

Adverb superlative:

This is her favorite.

This is my favorite.

The superlatives need definite articles, adjectives need juxtaposition, adverbs need juxtaposition or not.