朽ちる (kuchiru) conjugation
to rot
朽ちる (くちる, kuchiru) is an ichidan verb. Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes. 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 | 朽ちる kuchiru | 朽ちます kuchimasu | The form you look up. Also the casual present and future. |
| Plain negative | 朽ちない kuchinai | 朽ちません kuchimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 朽ちた kuchita | 朽ちました kuchimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 朽ちなかった kuchinakatta | 朽ちませんでした kuchimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 朽ちて kuchite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 朽ちている kuchiteiru | 朽ちています kuchiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 朽ちたい kuchitai | 朽ちたいです kuchitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 朽ちよう kuchiyou | 朽ちましょう kuchimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 朽ちられる kuchirareru | 朽ちられます kuchiraremasu | “can ~”. What you could do; the object often takes が. |
| Passive | 朽ちられる kuchirareru | 朽ちられます kuchiraremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 朽ちさせる kuchisaseru | 朽ちさせます kuchisasemasu | Make or let someone do it. |
| Causative-passive | 朽ちさせられる kuchisaserareru | 朽ちさせられます kuchisaseraremasu | Be made to do it — the long one. |
| Imperative | 朽ちろ kuchiro | 朽ちてください kuchitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 朽ちるな kuchiruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 朽ちれば kuchireba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 朽ちたら kuchitara | — | “if / when ~”. The everyday conditional. |
🔊 Tap any Japanese word to hear it spoken.
Why it conjugates this way
Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes.
See the full rules on the verb conjugation guide.