制する (seisuru) conjugation
to control, to command
制する (せいする, seisuru) 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 | 制する seisuru | 制します seishimasu | The form you look up. Also the casual present and future. |
| Plain negative | 制しない seishinai | 制しません seishimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 制した seishita | 制しました seishimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 制しなかった seishinakatta | 制しませんでした seishimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 制して seishite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 制している seishiteiru | 制しています seishiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 制したい seishitai | 制したいです seishitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 制しよう seishiyou | 制しましょう seishimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 制できる seidekiru | 制できます seidekimasu | “can ~”. What you could do; the object often takes が. |
| Passive | 制される seisareru | 制されます seisaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 制させる seisaseru | 制させます seisasemasu | Make or let someone do it. |
| Causative-passive | 制させられる seisaserareru | 制させられます seisaseraremasu | Be made to do it — the long one. |
| Imperative | 制しろ seishiro | 制してください seishitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 制するな seisuruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 制すれば seisureba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 制したら seishitara | — | “if / when ~”. The everyday conditional. |
🔊 Tap any Japanese word to hear it spoken.
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.