痩せる (yaseru) conjugation
to lose weight
痩せる (やせる, yaseru) 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 | 痩せる yaseru | 痩せます yasemasu | The form you look up. Also the casual present and future. |
| Plain negative | 痩せない yasenai | 痩せません yasemasen | “doesn’t / won’t”. From here it conjugates like an i-adjective. |
| Plain past | 痩せた yaseta | 痩せました yasemashita | The casual past — same ending as the te-form, with た/だ. |
| Plain past negative | 痩せなかった yasenakatta | 痩せませんでした yasemasendeshita | “didn’t”. The negative past, still i-adjective-shaped. |
| Te-form | 痩せて yasete | — | The connector: requests, linking clauses, ~ている. |
| Progressive (~ている) | 痩せている yaseteiru | 痩せています yaseteimasu | “is ~ing”, or an ongoing resulting state. |
| Desire (~たい) | 痩せたい yasetai | 痩せたいです yasetaidesu | “want to ~”. Behaves as an i-adjective. |
| Volitional | 痩せよう yaseyou | 痩せましょう yasemashou | “let’s ~” / “I think I’ll ~”. |
| Potential | 痩せられる yaserareru | 痩せられます yaseraremasu | “can ~”. What you could do; the object often takes が. |
| Passive | 痩せられる yaserareru | 痩せられます yaseraremasu | “is ~ed”. Also the honorific and the suffering passive. |
| Causative | 痩せさせる yasesaseru | 痩せさせます yasesasemasu | Make or let someone do it. |
| Causative-passive | 痩せさせられる yasesaserareru | 痩せさせられます yasesaseraremasu | Be made to do it — the long one. |
| Imperative | 痩せろ yasero | 痩せてください yasetekudasai | Blunt order. Use ~てください in real life. |
| Prohibitive | 痩せるな yaseruna | — | “don’t!” — dictionary form + な. |
| Conditional (~ば) | 痩せれば yasereba | — | “if ~”. General rules and hypotheticals. |
| Conditional (~たら) | 痩せたら yasetara | — | “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.