照らす (terasu) conjugation
to shine on, to illuminate
照らす (てらす, terasu) 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 | 照らす terasu | 照らします terashimasu | The form you look up. Also the casual present and future. |
| Plain negative | 照らさない terasanai | 照らしません terashimasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 照らした terashita | 照らしました terashimashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 照らさなかった terasanakatta | 照らしませんでした terashimasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 照らして terashite | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 照らしている terashiteiru | 照らしています terashiteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 照らしたい terashitai | 照らしたいです terashitaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 照らそう terasou | 照らしましょう terashimashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 照らせる teraseru | 照らせます terasemasu | “can ~”. What you could do; the object often takes が. |
| Passive | 照らされる terasareru | 照らされます terasaremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 照らさせる terasaseru | 照らさせます terasasemasu | Make or let someone do it. |
| Causative-passive | 照らさせられる terasaserareru | 照らさせられます terasaseraremasu | Be made to do it — the long one. |
| Imperative | 照らせ terase | 照らしてください terashitekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 照らすな terasuna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 照らせば teraseba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 照らしたら terashitara | — | “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.