汚す (yogosu) conjugation
to pollute, to make dirty
汚す (よごす, yogosu) 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 | 汚す yogosu | 汚します yogoshimasu | The form you look up. Also the casual present and future. |
| Plain negative | 汚さない yogosanai | 汚しません yogoshimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 汚した yogoshita | 汚しました yogoshimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 汚さなかった yogosanakatta | 汚しませんでした yogoshimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 汚して yogoshite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 汚している yogoshiteiru | 汚しています yogoshiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 汚したい yogoshitai | 汚したいです yogoshitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 汚そう yogosou | 汚しましょう yogoshimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 汚せる yogoseru | 汚せます yogosemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 汚される yogosareru | 汚されます yogosaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 汚させる yogosaseru | 汚させます yogosasemasu | Make or let someone do it. |
| Causative-passive | 汚させられる yogosaserareru | 汚させられます yogosaseraremasu | Be made to do it — the long one. |
| Imperative | 汚せ yogose | 汚してください yogoshitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 汚すな yogosuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 汚せば yogoseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 汚したら yogoshitara | — | “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.