起こす (okosu) conjugation
to wake (someone) up
起こす (おこす, okosu) 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 | 起こす okosu | 起こします okoshimasu | The form you look up. Also the casual present and future. |
| Plain negative | 起こさない okosanai | 起こしません okoshimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 起こした okoshita | 起こしました okoshimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 起こさなかった okosanakatta | 起こしませんでした okoshimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 起こして okoshite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 起こしている okoshiteiru | 起こしています okoshiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 起こしたい okoshitai | 起こしたいです okoshitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 起こそう okosou | 起こしましょう okoshimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 起こせる okoseru | 起こせます okosemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 起こされる okosareru | 起こされます okosaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 起こさせる okosaseru | 起こさせます okosasemasu | Make or let someone do it. |
| Causative-passive | 起こさせられる okosaserareru | 起こさせられます okosaseraremasu | Be made to do it — the long one. |
| Imperative | 起こせ okose | 起こしてください okoshitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 起こすな okosuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 起こせば okoseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 起こしたら okoshitara | — | “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.