There are 4 different structures : The one-syllable adjectives (AA) Adjective + Adjective + 的 (+ Noun) It allows to accentuate the meaning of the sentence. The two-syllable adjectives (AABB) A A B B + 的 (+ Noun) Attention: some two-syllable adjectives can't be duplicated! The duplicated adjectives used as adverbs (AABB) A A B B + 地 + Verb The duplicated adjectives used as predicates (ABAB) Subject + A B A B NOTE - There is no need to add a verb in the sentence since the duplicated adjective is already used as a verb.