防ぐ (fusegu) conjugation
to defend (against), to protect, to prevent
防ぐ (ふせぐ, fusegu) 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 | 防ぐ fusegu | 防ぎます fusegimasu | The form you look up. Also the casual present and future. |
| Plain negative | 防がない fuseganai | 防ぎません fusegimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 防いだ fuseida | 防ぎました fusegimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 防がなかった fuseganakatta | 防ぎませんでした fusegimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 防いで fuseide | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 防いでいる fuseideiru | 防いでいます fuseideimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 防ぎたい fusegitai | 防ぎたいです fusegitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 防ごう fusegou | 防ぎましょう fusegimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 防げる fusegeru | 防げます fusegemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 防がれる fusegareru | 防がれます fusegaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 防がせる fusegaseru | 防がせます fusegasemasu | Make or let someone do it. |
| Causative-passive | 防がされる fusegasareru | 防がされます fusegasaremasu | Be made to do it — the long one. |
| Imperative | 防げ fusege | 防いでください fuseidekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 防ぐな fuseguna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 防げば fusegeba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 防いだら fuseidara | — | “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.