沸かす
わかす
to boil
Wakasu (沸かす) is a godan verb meaning "to boil". Its polite form is 沸かします (wakashimasu), its te form is 沸かして (wakashite), its past form is 沸かした (wakashita), and its negative form is 沸かさない (wakasanai).
Godan verbJLPT N4
Wakasu (沸かす) conjugation quick reference
沸かす means "to boil". Its main forms are listed below, with links to the grammar pattern behind each form.
Wakasu example sentences
お湯を沸かします。
I will boil water.
昨日、スープを沸かしました。
I boiled soup yesterday.
まだお湯を沸かしていません。
I haven't boiled the water yet.
How to use Wakasu: grammar notes
•Use 沸かす with the particle を to show what you're boiling—for example, お湯を沸かす means "to boil water."
•Don’t confuse 沸かす (to boil something) with 沸く (to boil on its own); use 沸かす when you are doing the action yourself.
•You can use 沸かして in sentences like お湯を沸かしてから、コーヒーを入れます ("After boiling the water, I make coffee")—this is a natural way to connect actions.
•JLPT N4 level
Common phrases with Wakasu
お湯を沸かす（おゆをわかす）
to boil water
お風呂を沸かす（おふろをわかす）
to heat up the bath
やかんでお茶を沸かす（やかんでおちゃをわかす）
to boil tea in a kettle
Wakasu (沸かす) conjugation table
| Form | Japanese | Romaji |
|---|---|---|
| Basic Forms | ||
| Dictionary Form | 沸かす | wakasu |
| Masu Form | 沸かします | wakashimasu |
| Te Form | 沸かして | wakashite |
| Past Form | 沸かした | wakashita |
| Negative Form | 沸かさない | wakasanai |
| Past Negative | 沸かさなかった | wakasanakatta |
| Polite Forms | ||
| Polite Present | 沸かします | wakashimasu |
| Polite Past | 沸かしました | wakashimashita |
| Polite Negative | 沸かしません | wakashimasen |
| Polite Past Negative | 沸かしませんでした | wakashimasendeshita |
| Advanced Forms | ||
| Potential Form | 沸かせる | wakaseru |
| Passive Form | 沸かされる | wakasareru |
| Causative Form | 沸かさせる | wakasaseru |
| Causative Passive | 沸かさされる | wakasasareru |
| Volitional Form | 沸かそう | wakasou |
| Imperative Form | 沸かせ | wakase |
| Conditional Forms | ||
| Conditional (ば) | 沸かせば | wakaseba |
| Conditional (たら) | 沸かしたら | wakashitara |
| Other Forms | ||
| Progressive Form | 沸かしている | wakashiteiru |
| Desire (たい) | 沸かしたい | wakashitai |
| Prohibition | 沸かすな | wakasuna |