言い出す (iidasu) conjugation
to start talking, to suggest
言い出す (いいだす, iidasu) is a godan verb. Godan verbs change their final kana up and down its column of the kana chart — the a-row for negatives, the i-row before ます, the e-row for potential and ば. 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 | 言い出す iidasu | 言い出します iidashimasu | The form you look up. Also the casual present and future. |
| Plain negative | 言い出さない iidasanai | 言い出しません iidashimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 言い出した iidashita | 言い出しました iidashimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 言い出さなかった iidasanakatta | 言い出しませんでした iidashimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 言い出して iidashite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 言い出している iidashiteiru | 言い出しています iidashiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 言い出したい iidashitai | 言い出したいです iidashitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 言い出そう iidasou | 言い出しましょう iidashimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 言い出せる iidaseru | 言い出せます iidasemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 言い出される iidasareru | 言い出されます iidasaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 言い出させる iidasaseru | 言い出させます iidasasemasu | Make or let someone do it. |
| Causative-passive | 言い出させられる iidasaserareru | 言い出させられます iidasaseraremasu | Be made to do it — the long one. |
| Imperative | 言い出せ iidase | 言い出してください iidashitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 言い出すな iidasuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 言い出せば iidaseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 言い出したら iidashitara | — | “if / when ~”. The everyday conditional. |
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Why it conjugates this way
Godan verbs change their final kana up and down its column of the kana chart — the a-row for negatives, the i-row before ます, the e-row for potential and ば.
See the full rules on the verb conjugation guide.