Adverb Forms Overview
Japanese adjectives can become adverbs to modify verbs. The formation differs for i-adjectives and na-adjectives.
I-adjective: 速い → 速く (quickly)
Na-adjective: 静か → 静かに (quietly)
I-adjective Adverb Form
Formation
Change い to く
速い (hayai) → 速く (hayaku) - quickly, fast
高い (takai) → 高く (takaku) - highly, expensively
美しい (utsukushii) → 美しく (utsukushiku) - beautifully
大きい (ookii) → 大きく (ookiku) - greatly, largely
Common I-adjective Adverbs
早い → 早く (hayaku) - early
遅い → 遅く (osoku) - late
近い → 近く (chikaku) - nearby, closely
遠い → 遠く (tooku) - far
強い → 強く (tsuyoku) - strongly
弱い → 弱く (yowaku) - weakly
多い → 多く (ooku) - many, much
少ない → 少なく (sukunaku) - few, little
Na-adjective Adverb Form
Formation
Add に to the na-adjective
静か (shizuka) → 静かに (shizuka ni) - quietly
きれい (kirei) → きれいに (kirei ni) - beautifully, cleanly
丁寧 (teinei) → 丁寧に (teinei ni) - politely, carefully
真面目 (majime) → 真面目に (majime ni) - seriously
簡単 (kantan) → 簡単に (kantan ni) - simply, easily
Common Na-adjective Adverbs
上手 → 上手に (jouzu ni) - skillfully
下手 → 下手に (heta ni) - poorly, unskillfully
親切 → 親切に (shinsetsu ni) - kindly
元気 → 元気に (genki ni) - energetically, vigorously
便利 → 便利に (benri ni) - conveniently
安全 → 安全に (anzen ni) - safely
Usage Patterns
Modifying Verbs
速く走る
"run fast"
静かに話す
"speak quietly"
きれいに書く
"write neatly"
丁寧に説明する
"explain politely/carefully"
Modifying Entire Sentences
早く帰ります
"I'll go home early"
大きく育つ
"grow big/greatly"
真面目に勉強する
"study seriously"
Special Case: いい/よい
いい / よい → よく (well)
よく分かる
"understand well"
よく寝る
"sleep well"
よく食べる
"eat well"
Common Adverb Patterns
Speed/Manner
速く (hayaku) - fast, quickly
遅く (osoku) - slowly, late
ゆっくり (yukkuri) - slowly, leisurely
急いで (isoide) - hurriedly
Degree
高く (takaku) - highly
低く (hikuku) - lowly
大きく (ookiku) - greatly
小さく (chiisaku) - slightly
多く (ooku) - much, many
少なく (sukunaku) - few, little
Quality
美しく (utsukushiku) - beautifully
きれいに (kirei ni) - beautifully, cleanly
上手に (jouzu ni) - skillfully
下手に (heta ni) - poorly
Manner
静かに (shizuka ni) - quietly
にぎやかに (nigiyaka ni) - lively
丁寧に (teinei ni) - politely, carefully
親切に (shinsetsu ni) - kindly
Conversation Examples
Example 1: Instructions
A: どう書けばいいですか？
"How should I write it?"
B: もっと大きく書いてください
"Please write it bigger"
A: こうですか？
"Like this?"
B: はい、そしてきれいに書いてください
"Yes, and please write it neatly"
Example 2: Daily Actions
A: 今朝早く起きた？
"Did you wake up early this morning?"
B: うん、6時に起きた
"Yeah, I woke up at 6"
A: すごい！
"Amazing!"
B: でも、ゆっくり朝ご飯を食べた
"But I ate breakfast slowly"
Example 3: Requests
A: ちょっと静かに話してください
"Please speak a little quietly"
B: すみません
"Sorry"
A: あと、もっとゆっくり話してください
"Also, please speak more slowly"
B: 分かりました
"Understood"
Using with する (to do/make)
Many adverbs work with する:
大きくする - make big, enlarge
小さくする - make small, reduce
きれいにする - make clean, tidy up
静かにする - make quiet, be quiet
元気にする - cheer up, invigorate
Examples
部屋をきれいにする
"clean/tidy up the room"
音を小さくしてください
"Please turn down the volume"
みんなを元気にする
"cheer everyone up"
Using with なる (to become)
Adverbs work with なる to express change:
大きくなる - become big, grow
小さくなる - become small, shrink
きれいになる - become clean/beautiful
静かになる - become quiet
元気になる - become healthy/energetic
Examples
子供が大きくなった
"The child grew up"
部屋がきれいになりました
"The room became clean"
病気が治って元気になった
"I recovered from illness and became healthy"
Comparing Adjectives and Adverbs
| Adjective | Adverb | Usage |
|---|---|---|
| 速い車 | 速く走る | fast car / run fast |
| 高い山 | 高く飛ぶ | tall mountain / fly high |
| 静かな部屋 | 静かに話す | quiet room / speak quietly |
| きれいな花 | きれいに咲く | beautiful flower / bloom beautifully |
Side by Side
Adjective modifying noun:
速い車 "fast car"
静かな部屋 "quiet room"
Adverb modifying verb:
速く走る "run fast"
静かに話す "speak quietly"
Common Adverb Expressions
Daily Activities
早く起きる - wake up early
遅く寝る - sleep late
よく食べる - eat well
ゆっくり歩く - walk slowly
速く走る - run fast
Speaking/Communication
静かに話す - speak quietly
大きく話す - speak loudly
ゆっくり話す - speak slowly
丁寧に説明する - explain politely
親切に教える - teach kindly
Writing/Creating
きれいに書く - write neatly
大きく書く - write big
小さく書く - write small
美しく描く - draw beautifully
Degree Modifiers with Adverbs
もっと (more)
もっと速く走って
"Run faster"
もっと静かにしてください
"Please be quieter"
もっときれいに書いて
"Write more neatly"
とても / すごく (very)
とても速く走る
"run very fast"
すごく静かに話す
"speak very quietly"
あまり～ない (not very)
あまり速く走らない
"don't run very fast"
あまり大きく書かない
"don't write very big"
Common Mistakes
Mistake 1: Using Adjective Instead of Adverb
Wrong: 速い走る ❌
Right: 速く走る ✓
"run fast"
Wrong: 静かな話す ❌
Right: 静かに話す ✓
"speak quietly"
Mistake 2: Wrong Adverb Form
Wrong: 静かく話す ❌
Right: 静かに話す ✓
Wrong: きれいく書く ❌
Right: きれいに書く ✓
Mistake 3: Using に with I-adjectives
Wrong: 速いに走る ❌
Right: 速く走る ✓
Wrong: 大きいに書く ❌
Right: 大きく書く ✓
Mistake 4: Using く with Na-adjectives
Wrong: 静かく話す ❌
Right: 静かに話す ✓
Wrong: きれいく書く ❌
Right: きれいに書く ✓
Multiple Adverbs
早く静かに起きる
"wake up early and quietly"
きれいに丁寧に書く
"write neatly and carefully"
ゆっくり大きく話す
"speak slowly and loudly"
Negative Adverb Forms
I-adjectives
高く → 高くなく (not highly)
速く → 速くなく (not fast)
高くなく飛ぶ
"fly not high"
速くなく走る
"run not fast"
Na-adjectives
静かに → 静かにせず / 静かでなく
きれいに → きれいにせず / きれいでなく
Idiomatic Adverb Expressions
よく (well, often)
よく分かる
"understand well"
よく来る
"come often"
よく寝る
"sleep well"
早く (early, quickly)
早く来て
"Come quickly"
早く帰る
"go home early"
遠く (far)
遠くから来る
"come from far away"
遠くに見える
"can see far away"
Practice Patterns
Transformation Practice
速い → 速く → 速く走る
高い → 高く → 高く飛ぶ
美しい → 美しく → 美しく咲く
静か → 静かに → 静かに話す
きれい → きれいに → きれいに書く
丁寧 → 丁寧に → 丁寧に説明する
Using in Sentences
Commands
もっと大きく書いて
"Write bigger"
静かにしてください
"Please be quiet"
ゆっくり話してください
"Please speak slowly"
Descriptions
彼は速く走る
"He runs fast"
彼女はきれいに歌う
"She sings beautifully"
先生は丁寧に教える
"The teacher teaches carefully"
Changes
だんだん大きくなる
"gradually become big"
急に静かになった
"suddenly became quiet"
少しずつきれいになる
"gradually become clean/beautiful"
Key Takeaways
✓ I-adjectives: い → く
✓ Na-adjectives: add に
✓ いい → よく (irregular)
✓ Modify verbs, not nouns
✓ Work with する/なる
✓ Can be negated
✓ Stack multiple adverbs
✓ Essential for natural expression
Master adverb forms - make your Japanese more dynamic!
Next: Adjective Comparisons (より)
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