沸く
わく
to boil, to grow hot
Godan verbJLPT N4
Example Sentences
お湯がわきます。
The water boils.
お風呂がわかなかった。
The bath didn't boil (heat up).
鍋の中がまだわいていません。
The pot is not boiling yet.
Grammar Notes & Usage Tips
•沸く is used for things like water or bathwater that boil or heat up on their own, so it usually appears with the subject particle が (e.g., お湯が沸きました = The water boiled).
•Don’t use 沸く with a direct object and を—since the water is doing the action itself, saying お湯を沸く is incorrect (use お湯を沸かす if you are boiling it yourself).
•To talk about something that just started boiling, you can say 沸いてきた (e.g., お湯が沸いてきた = The water has started to boil).
•JLPT N4 level
Common Phrases & Expressions
お湯が沸く（おゆがわく）
The water is boiling / The water boils
風呂が沸く（ふろがわく）
The bath is ready / The bathwater is hot
会場が沸く（かいじょうがわく）
The venue erupts (in excitement/applause)
Complete Conjugation Table
Basic Forms
Dictionary Form
沸く
Masu Form
沸きます
Te Form
沸いて
Past Form
沸いた
Negative Form
沸かない
Past Negative
沸かなかった
Polite Forms
Polite Present
沸きます
Polite Past
沸きました
Polite Negative
沸きません
Polite Past Negative
沸きませんでした
Advanced Forms
Potential Form
沸ける
Passive Form
沸かれる
Causative Form
沸かせる
Causative Passive
沸かされる
Volitional Form
沸こう
Imperative Form
沸け
Conditional Forms
Conditional (ば)
沸けば
Conditional (たら)
沸いたら
Other Forms
Progressive Form
沸いている
Desire (たい)
沸きたい
Prohibition
沸くな