塞ぐ (fusagu) conjugation
to stuff, to close up, to block (up)
塞ぐ (ふさぐ, fusagu) 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 | 塞ぐ fusagu | 塞ぎます fusagimasu | The form you look up. Also the casual present and future. |
| Plain negative | 塞がない fusaganai | 塞ぎません fusagimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 塞いだ fusaida | 塞ぎました fusagimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 塞がなかった fusaganakatta | 塞ぎませんでした fusagimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 塞いで fusaide | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 塞いでいる fusaideiru | 塞いでいます fusaideimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 塞ぎたい fusagitai | 塞ぎたいです fusagitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 塞ごう fusagou | 塞ぎましょう fusagimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 塞げる fusageru | 塞げます fusagemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 塞がれる fusagareru | 塞がれます fusagaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 塞がせる fusagaseru | 塞がせます fusagasemasu | Make or let someone do it. |
| Causative-passive | 塞がされる fusagasareru | 塞がされます fusagasaremasu | Be made to do it — the long one. |
| Imperative | 塞げ fusage | 塞いでください fusaidekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 塞ぐな fusaguna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 塞げば fusageba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 塞いだら fusaidara | — | “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.