有する (yuusuru) conjugation
to own, to be endowed with
有する (ゆうする, yuusuru) is an irregular verb. Only する and 来る are truly irregular, and every learner meets them in week one. 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 | 有する yuusuru | 有します yuushimasu | The form you look up. Also the casual present and future. |
| Plain negative | 有しない yuushinai | 有しません yuushimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 有した yuushita | 有しました yuushimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 有しなかった yuushinakatta | 有しませんでした yuushimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 有して yuushite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 有している yuushiteiru | 有しています yuushiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 有したい yuushitai | 有したいです yuushitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 有しよう yuushiyou | 有しましょう yuushimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 有できる yuudekiru | 有できます yuudekimasu | “can ~”. What you could do; the object often takes が. |
| Passive | 有される yuusareru | 有されます yuusaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 有させる yuusaseru | 有させます yuusasemasu | Make or let someone do it. |
| Causative-passive | 有させられる yuusaserareru | 有させられます yuusaseraremasu | Be made to do it — the long one. |
| Imperative | 有しろ yuushiro | 有してください yuushitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 有するな yuusuruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 有すれば yuusureba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 有したら yuushitara | — | “if / when ~”. The everyday conditional. |
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Why it conjugates this way
Only する and 来る are truly irregular, and every learner meets them in week one.
See the full rules on the verb conjugation guide.