落す (otosu) conjugation
to drop, to lose
落す (おとす, otosu) 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 | 落す otosu | 落します otoshimasu | The form you look up. Also the casual present and future. |
| Plain negative | 落さない otosanai | 落しません otoshimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 落した otoshita | 落しました otoshimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 落さなかった otosanakatta | 落しませんでした otoshimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 落して otoshite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 落している otoshiteiru | 落しています otoshiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 落したい otoshitai | 落したいです otoshitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 落そう otosou | 落しましょう otoshimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 落せる otoseru | 落せます otosemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 落される otosareru | 落されます otosaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 落させる otosaseru | 落させます otosasemasu | Make or let someone do it. |
| Causative-passive | 落させられる otosaserareru | 落させられます otosaseraremasu | Be made to do it — the long one. |
| Imperative | 落せ otose | 落してください otoshitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 落すな otosuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 落せば otoseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 落したら otoshitara | — | “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.