澄む (sumu) conjugation
to clear (e.g., weather), to become transparent
澄む (すむ, sumu) 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 | 澄む sumu | 澄みます sumimasu | The form you look up. Also the casual present and future. |
| Plain negative | 澄まない sumanai | 澄みません sumimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 澄んだ sunda | 澄みました sumimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 澄まなかった sumanakatta | 澄みませんでした sumimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 澄んで sunde | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 澄んでいる sundeiru | 澄んでいます sundeimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 澄みたい sumitai | 澄みたいです sumitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 澄もう sumou | 澄みましょう sumimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 澄める sumeru | 澄めます sumemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 澄まれる sumareru | 澄まれます sumaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 澄ませる sumaseru | 澄ませます sumasemasu | Make or let someone do it. |
| Causative-passive | 澄まされる sumasareru | 澄まされます sumasaremasu | Be made to do it — the long one. |
| Imperative | 澄め sume | 澄んでください sundekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 澄むな sumuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 澄めば sumeba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 澄んだら sundara | — | “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.