Japanese adjectives conjugate to become adverbs. We can change I adjectives that end with syllable I, such as HAYAI (early), to adverbs by changing the final I to KU. So, HAYAI becomes HAYAKU.

This is what is referred to as preserving parallel structure. For instance, nouns must match with nouns, adjectives with adjectives, prepositions with prepositions, and adverbs with adverbs. In order ...

most adjectives are one-word components that enhance or modify nouns. Any sentence may contain two or more adjectives, but the function of each adjective remains the same. Possessive adjectives ...