尽くす (tsukusu) conjugation
to exhaust, to run out; to devote, to serve
尽くす (つくす, tsukusu) 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 | 尽くす tsukusu | 尽くします tsukushimasu | The form you look up. Also the casual present and future. |
| Plain negative | 尽くさない tsukusanai | 尽くしません tsukushimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 尽くした tsukushita | 尽くしました tsukushimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 尽くさなかった tsukusanakatta | 尽くしませんでした tsukushimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 尽くして tsukushite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 尽くしている tsukushiteiru | 尽くしています tsukushiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 尽くしたい tsukushitai | 尽くしたいです tsukushitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 尽くそう tsukusou | 尽くしましょう tsukushimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 尽くせる tsukuseru | 尽くせます tsukusemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 尽くされる tsukusareru | 尽くされます tsukusaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 尽くさせる tsukusaseru | 尽くさせます tsukusasemasu | Make or let someone do it. |
| Causative-passive | 尽くさせられる tsukusaserareru | 尽くさせられます tsukusaseraremasu | Be made to do it — the long one. |
| Imperative | 尽くせ tsukuse | 尽くしてください tsukushitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 尽くすな tsukusuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 尽くせば tsukuseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 尽くしたら tsukushitara | — | “if / when ~”. The everyday conditional. |
🔊 Tap any Japanese word to hear it spoken.
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.