伴う (tomonau) conjugation
to accompany, to bring with
伴う (ともなう, tomonau) 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 | 伴う tomonau | 伴います tomonaimasu | The form you look up. Also the casual present and future. |
| Plain negative | 伴わない tomonawanai | 伴いません tomonaimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 伴った tomonatta | 伴いました tomonaimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 伴わなかった tomonawanakatta | 伴いませんでした tomonaimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 伴って tomonatte | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 伴っている tomonatteiru | 伴っています tomonatteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 伴いたい tomonaitai | 伴いたいです tomonaitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 伴おう tomonaou | 伴いましょう tomonaimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 伴える tomonaeru | 伴えます tomonaemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 伴われる tomonawareru | 伴われます tomonawaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 伴わせる tomonawaseru | 伴わせます tomonawasemasu | Make or let someone do it. |
| Causative-passive | 伴わされる tomonawasareru | 伴わされます tomonawasaremasu | Be made to do it — the long one. |
| Imperative | 伴え tomonae | 伴ってください tomonattekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 伴うな tomonauna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 伴えば tomonaeba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 伴ったら tomonattara | — | “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.