恋する (koisuru) conjugation
to fall in love with, to love
恋する (こいする, koisuru) 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 | 恋する koisuru | 恋します koishimasu | The form you look up. Also the casual present and future. |
| Plain negative | 恋しない koishinai | 恋しません koishimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 恋した koishita | 恋しました koishimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 恋しなかった koishinakatta | 恋しませんでした koishimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 恋して koishite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 恋している koishiteiru | 恋しています koishiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 恋したい koishitai | 恋したいです koishitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 恋しよう koishiyou | 恋しましょう koishimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 恋できる koidekiru | 恋できます koidekimasu | “can ~”. What you could do; the object often takes が. |
| Passive | 恋される koisareru | 恋されます koisaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 恋させる koisaseru | 恋させます koisasemasu | Make or let someone do it. |
| Causative-passive | 恋させられる koisaserareru | 恋させられます koisaseraremasu | Be made to do it — the long one. |
| Imperative | 恋しろ koishiro | 恋してください koishitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 恋するな koisuruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 恋すれば koisureba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 恋したら koishitara | — | “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.