Translated examples
毎朝、早く起きます。
I get up early every morning.
名前を大きく書いてください。
Please write your name in large letters.
静かに話してください。
Please speak quietly.
丁寧に説明します。
I will explain carefully.
手をきれいに洗います。
I wash my hands clean.
よく考えてください。
Please think carefully.
To say how an action happens, use the adverbial form of an adjective. I-adjectives change final い to く; na-adjectives use に. Compare 静かな部屋, a quiet room, with 静かに話す, to speak quietly.
Formation and use
早い becomes 早く and 大きい becomes 大きく: 早く起きます, 大きく書きます. The adjective no longer directly modifies a noun; it describes the manner or degree of the action.
Na-adjectives use に, not な, before the verb: 静かに話す, 丁寧に書く, きれいに洗う. The same stem can use な before a noun in a different sentence.
Comparisons and common errors
いい has the adverbial form よく. よく can describe doing something well, and in other contexts it expresses frequency. Read the verb and context instead of assigning it one English meaning.
Do not confuse this に with a destination or a clock time. In 静かに話します, 静か is a quality, so the phrase describes how the speaking happens.
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