思い込む (omoikomu) conjugation
to be under impression that, to be convinced that
思い込む (おもいこむ, omoikomu) 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 | 思い込む omoikomu | 思い込みます omoikomimasu | The form you look up. Also the casual present and future. |
| Plain negative | 思い込まない omoikomanai | 思い込みません omoikomimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 思い込んだ omoikonda | 思い込みました omoikomimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 思い込まなかった omoikomanakatta | 思い込みませんでした omoikomimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 思い込んで omoikonde | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 思い込んでいる omoikondeiru | 思い込んでいます omoikondeimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 思い込みたい omoikomitai | 思い込みたいです omoikomitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 思い込もう omoikomou | 思い込みましょう omoikomimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 思い込める omoikomeru | 思い込めます omoikomemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 思い込まれる omoikomareru | 思い込まれます omoikomaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 思い込ませる omoikomaseru | 思い込ませます omoikomasemasu | Make or let someone do it. |
| Causative-passive | 思い込まされる omoikomasareru | 思い込まされます omoikomasaremasu | Be made to do it — the long one. |
| Imperative | 思い込め omoikome | 思い込んでください omoikondekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 思い込むな omoikomuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 思い込めば omoikomeba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 思い込んだら omoikondara | — | “if / when ~”. The everyday conditional. |
🔊 Tap any Japanese word to hear it spoken.
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.