Using Adjectives as Adverbs
The Japanese language has a relatively simple method for modifying adjectives into adverbs that mirrors the English language’s method, such as when changing the adjective “technical” into the adverb “technically” by simply adding a suffix to the stem word.
For い-Adjectives, we simply add く to the stem of the respective adjective.
遅い – slow, 遅く – slowly
よい – good, よく – well
For な-Adjectives, we simply add に to the stem of the respective adjective.
静か – quiet, 静かに – quietly
簡単 – simple, 簡単に – simply