積もる (tsumoru) conjugation
to pile up
積もる (つもる, tsumoru) 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 | 積もる tsumoru | 積もります tsumorimasu | The form you look up. Also the casual present and future. |
| Plain negative | 積もらない tsumoranai | 積もりません tsumorimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 積もった tsumotta | 積もりました tsumorimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 積もらなかった tsumoranakatta | 積もりませんでした tsumorimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 積もって tsumotte | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 積もっている tsumotteiru | 積もっています tsumotteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 積もりたい tsumoritai | 積もりたいです tsumoritaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 積もろう tsumorou | 積もりましょう tsumorimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 積もれる tsumoreru | 積もれます tsumoremasu | “can ~”. What you could do; the object often takes が. |
| Passive | 積もられる tsumorareru | 積もられます tsumoraremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 積もらせる tsumoraseru | 積もらせます tsumorasemasu | Make or let someone do it. |
| Causative-passive | 積もらされる tsumorasareru | 積もらされます tsumorasaremasu | Be made to do it — the long one. |
| Imperative | 積もれ tsumore | 積もってください tsumottekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 積もるな tsumoruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 積もれば tsumoreba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 積もったら tsumottara | — | “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.