起こす
おこす
to wake (someone) up
Okosu (起こす) is a godan verb meaning "to wake (someone) up". Its polite form is 起こします (okoshimasu), its te form is 起こして (okoshite), its past form is 起こした (okoshita), and its negative form is 起こさない (okosanai).
Godan verbJLPT N4
Okosu (起こす) conjugation quick reference
起こす means "to wake (someone) up". Its main forms are listed below, with links to the grammar pattern behind each form.
Okosu example sentences
母が私を毎朝起こします。
My mom wakes me up every morning.
昨日、友だちを起こしました。
I woke up my friend yesterday.
弟を起こしませんでした。
I didn’t wake up my little brother.
How to use Okosu: grammar notes
•Use を to mark the person you're waking up — for example, 先生を起こしました means "I woke up the teacher."
•Don't confuse 起こす (to wake someone else up) with 起きる (to wake up yourself); many beginners mix them up!
•You can add time with に — like 7時に妹を起こします means "I wake up my little sister at 7 o'clock."
•JLPT N4 level
Common phrases with Okosu
朝 7時に起こして（ください）
Please wake me up at 7 a.m.
母が毎朝私を起こす
My mom wakes me up every morning
起こしに来たよ
I came to wake you up
Okosu (起こす) conjugation table
| Form | Japanese | Romaji |
|---|---|---|
| Basic Forms | ||
| Dictionary Form | 起こす | okosu |
| Masu Form | 起こします | okoshimasu |
| Te Form | 起こして | okoshite |
| Past Form | 起こした | okoshita |
| Negative Form | 起こさない | okosanai |
| Past Negative | 起こさなかった | okosanakatta |
| Polite Forms | ||
| Polite Present | 起こします | okoshimasu |
| Polite Past | 起こしました | okoshimashita |
| Polite Negative | 起こしません | okoshimasen |
| Polite Past Negative | 起こしませんでした | okoshimasendeshita |
| Advanced Forms | ||
| Potential Form | 起こせる | okoseru |
| Passive Form | 起こされる | okosareru |
| Causative Form | 起こさせる | okosaseru |
| Causative Passive | 起こさされる | okosasareru |
| Volitional Form | 起こそう | okosou |
| Imperative Form | 起こせ | okose |
| Conditional Forms | ||
| Conditional (ば) | 起こせば | okoseba |
| Conditional (たら) | 起こしたら | okoshitara |
| Other Forms | ||
| Progressive Form | 起こしている | okoshiteiru |
| Desire (たい) | 起こしたい | okoshitai |
| Prohibition | 起こすな | okosuna |