増やす (fuyasu) conjugation
to increase (v.t.), to add to
増やす (ふやす, fuyasu) is a godan verb. Godan verbs change their final kana up and down its column of the kana chart — the a-row for negatives, the i-row before ます, the e-row for potential and ば. Every form below is tappable — hear it, then say it back.
Conjugation table
| Form | Plain (casual) | Polite (~ます) | When you use it |
|---|---|---|---|
| Dictionary / plain | 増やす fuyasu | 増やします fuyashimasu | The form you look up. Also the casual present and future. |
| Plain negative | 増やさない fuyasanai | 増やしません fuyashimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 増やした fuyashita | 増やしました fuyashimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 増やさなかった fuyasanakatta | 増やしませんでした fuyashimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 増やして fuyashite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 増やしている fuyashiteiru | 増やしています fuyashiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 増やしたい fuyashitai | 増やしたいです fuyashitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 増やそう fuyasou | 増やしましょう fuyashimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 増やせる fuyaseru | 増やせます fuyasemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 増やされる fuyasareru | 増やされます fuyasaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 増やさせる fuyasaseru | 増やさせます fuyasasemasu | Make or let someone do it. |
| Causative-passive | 増やさせられる fuyasaserareru | 増やさせられます fuyasaseraremasu | Be made to do it — the long one. |
| Imperative | 増やせ fuyase | 増やしてください fuyashitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 増やすな fuyasuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 増やせば fuyaseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 増やしたら fuyashitara | — | “if / when ~”. The everyday conditional. |
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Why it conjugates this way
Godan verbs change their final kana up and down its column of the kana chart — the a-row for negatives, the i-row before ます, the e-row for potential and ば.
See the full rules on the verb conjugation guide.