適する (tekisuru) conjugation
to fit, to suit
適する (てきする, tekisuru) 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 | 適する tekisuru | 適します tekishimasu | The form you look up. Also the casual present and future. |
| Plain negative | 適しない tekishinai | 適しません tekishimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 適した tekishita | 適しました tekishimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 適しなかった tekishinakatta | 適しませんでした tekishimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 適して tekishite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 適している tekishiteiru | 適しています tekishiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 適したい tekishitai | 適したいです tekishitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 適しよう tekishiyou | 適しましょう tekishimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 適できる tekidekiru | 適できます tekidekimasu | “can ~”. What you could do; the object often takes が. |
| Passive | 適される tekisareru | 適されます tekisaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 適させる tekisaseru | 適させます tekisasemasu | Make or let someone do it. |
| Causative-passive | 適させられる tekisaserareru | 適させられます tekisaseraremasu | Be made to do it — the long one. |
| Imperative | 適しろ tekishiro | 適してください tekishitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 適するな tekisuruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 適すれば tekisureba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 適したら tekishitara | — | “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.