凝らす (korasu) conjugation
to concentrate, to devote, to peer into
凝らす (こらす, korasu) 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 | 凝らす korasu | 凝らします korashimasu | The form you look up. Also the casual present and future. |
| Plain negative | 凝らさない korasanai | 凝らしません korashimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 凝らした korashita | 凝らしました korashimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 凝らさなかった korasanakatta | 凝らしませんでした korashimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 凝らして korashite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 凝らしている korashiteiru | 凝らしています korashiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 凝らしたい korashitai | 凝らしたいです korashitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 凝らそう korasou | 凝らしましょう korashimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 凝らせる koraseru | 凝らせます korasemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 凝らされる korasareru | 凝らされます korasaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 凝らさせる korasaseru | 凝らさせます korasasemasu | Make or let someone do it. |
| Causative-passive | 凝らさせられる korasaserareru | 凝らさせられます korasaseraremasu | Be made to do it — the long one. |
| Imperative | 凝らせ korase | 凝らしてください korashitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 凝らすな korasuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 凝らせば koraseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 凝らしたら korashitara | — | “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.