What is Adverb Formation?
Adverb formation in Japanese turns adjectives into adverbs that modify verbs, adjectives, or sentences. い-adjectives change to く form, while な-adjectives take に. These adverbs describe how, when, or to what degree an action occurs.
速い (fast - adjective) → 速く (fast - adverb)
速く走る "run fast"
静か (quiet - adjective) → 静かに (quietly - adverb)
静かに話す "speak quietly"
い-Adjective Adverbs
Formation: drop い, add く
高い → 高く "highly/expensive-ly"
速い → 速く "fast"
強い → 強く "strongly"
早い → 早く "early"
多い → 多く "much/many"
高く飛ぶ "fly high"
速く走る "run fast"
強く押す "push strongly"
Usage with verbs
早く起きる
"Wake up early"
大きく開ける
"Open widely"
小さく書く
"Write small"
Modifies the verb
な-Adjective Adverbs
Formation: adjective + に
静か → 静かに "quietly"
きれい → きれいに "beautifully/cleanly"
元気 → 元気に "energetically"
丁寧 → 丁寧に "politely/carefully"
真面目 → 真面目に "seriously"
静かに話す "speak quietly"
きれいに書く "write neatly"
元気に遊ぶ "play energetically"
Usage
丁寧に教える
"Teach carefully"
真面目に勉強する
"Study seriously"
Describes manner
Common い-Adjective Adverbs
Degree and extent
多く "much/many"
少なく "few/little"
長く "long (time/length)"
短く "short"
広く "widely"
深く "deeply"
多く食べる "eat a lot"
長く続ける "continue for long"
Speed and intensity
速く "fast"
遅く "slow"
強く "strongly"
弱く "weakly"
激しく "intensely"
速く走る "run fast"
強く打つ "hit strongly"
Quality
良く/よく "well"
悪く "badly"
正しく "correctly"
詳しく "in detail"
よく分かる "understand well"
正しく使う "use correctly"
Common な-Adjective Adverbs
Manner
静かに "quietly"
丁寧に "carefully/politely"
簡単に "easily"
楽に "comfortably/easily"
自由に "freely"
静かに歩く "walk quietly"
簡単に解ける "solve easily"
State
元気に "energetically"
健康に "healthily"
幸せに "happily"
安全に "safely"
元気に挨拶する "greet energetically"
安全に運転する "drive safely"
Special Cases
いい/よい → よく
いい → よく (irregular)
"good" → "well"
よく分かる "understand well"
よく見る "look carefully"
よく寝る "sleep well"
Irregular formation
Most common adverb
同じ → 同じように
同じ → 同じように
"same" → "in the same way"
同じように作る
"Make in the same way"
Pre-noun adjective
Needs ように
Modifying Other Adjectives
Adverb + adjective
とても大きい
"Very big"
すごく美味しい
"Extremely delicious"
少し難しい
"A little difficult"
Degree modification
Negative Adverbs
With ない
高くない
"Not expensive"
静かじゃない/静かでない
"Not quiet"
Used with negative forms
Adverbs Modifying Adverbs
とても速く走る
"Run very fast"
もっと静かに話す
"Speak more quietly"
かなり詳しく説明する
"Explain quite in detail"
Layered modification
Position in Sentence
Before what it modifies
速く走る
"Run fast" (modifies verb)
とても美味しい
"Very delicious" (modifies adjective)
Usually precedes
Contractions in Speech
Casual forms
すごく → すげー (very casual)
めっちゃ (Kansai: very)
ちょー (slang: super)
Informal speech
Regional variations
Common Patterns
よく + verb
よく分かる "understand well"
よく知る "know well"
よく見る "often see/look carefully"
よく食べる "eat often/well"
Multiple meanings
Context dependent
早く + verb
早く起きる "wake up early"
早く来る "come early"
早く終わる "finish early"
Time-related
Adverbs from Nouns
Noun + に
毎日 → 毎日に (rare)
Usually: 毎日 (functions as adverb)
一生懸命 → 一生懸命に
"with all one's might"
一緒 → 一緒に
"together"
Some nouns become adverbs
Common Mistakes
Wrong ending
Wrong: 速いに ⚠️
Correct: 速く ✓
"Fast"
い-adjectives use く
Forgetting に
Wrong: 静か話す ⚠️
Correct: 静かに話す ✓
"Speak quietly"
な-adjectives need に
Using adjective form with verbs
Wrong: 速い走る ⚠️
Correct: 速く走る ✓
"Run fast"
Must convert to adverb
Multiple Adverbs
Stacking
とても速く走る
"Run very fast"
もっときれいに書く
"Write more neatly"
Can layer adverbs
Intensifiers
Common intensifying adverbs
とても "very"
すごく "extremely"
非常に "extremely" (formal)
かなり "quite/considerably"
ちょっと/少し "a little"
あまり "not very" (with negative)
Modify degree
Practice Sentences
Basic
速く走る
"Run fast"
静かに話す
"Speak quietly"
よく分かる
"Understand well"
早く起きる
"Wake up early"
きれいに書く
"Write neatly"
丁寧に教える
"Teach carefully"
Intermediate
もっと速く走らないと、
間に合わない。
"If you don't run faster,
you won't make it."
静かに話してください。
赤ちゃんが寝ています。
"Please speak quietly.
The baby is sleeping."
この仕事は丁寧にやらなければ
ならない。時間をかけて、
正しく進めましょう。
"This work must be done carefully.
Let's take our time and
proceed correctly."
毎日一生懸命に日本語を
勉強している。少しずつだが、
よく分かるようになってきた。
"I'm studying Japanese hard every day.
Little by little,
I've come to understand well."