確かめる (tashikameru) conjugation
to ascertain, to make sure
確かめる (たしかめる, tashikameru) is an ichidan verb. Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes. 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 | 確かめる tashikameru | 確かめます tashikamemasu | The form you look up. Also the casual present and future. |
| Plain negative | 確かめない tashikamenai | 確かめません tashikamemasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 確かめた tashikameta | 確かめました tashikamemashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 確かめなかった tashikamenakatta | 確かめませんでした tashikamemasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 確かめて tashikamete | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 確かめている tashikameteiru | 確かめています tashikameteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 確かめたい tashikametai | 確かめたいです tashikametaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 確かめよう tashikameyou | 確かめましょう tashikamemashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 確かめられる tashikamerareru | 確かめられます tashikameraremasu | “can ~”. What you could do; the object often takes が. |
| Passive | 確かめられる tashikamerareru | 確かめられます tashikameraremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 確かめさせる tashikamesaseru | 確かめさせます tashikamesasemasu | Make or let someone do it. |
| Causative-passive | 確かめさせられる tashikamesaserareru | 確かめさせられます tashikamesaseraremasu | Be made to do it — the long one. |
| Imperative | 確かめろ tashikamero | 確かめてください tashikametekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 確かめるな tashikameruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 確かめれば tashikamereba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 確かめたら tashikametara | — | “if / when ~”. The everyday conditional. |
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Why it conjugates this way
Ichidan verbs are the tidy ones: drop the final る and add the ending. Nothing inside the word ever changes.
See the full rules on the verb conjugation guide.