Ichidan verb

痩せるやせる

yaseru

to become thin · N4

痩せる (やせる, yaseru) — to become thin — is an ichidan verb: 痩せて (te-form), 痩せた (past), 痩せない (negative), 痩せます (polite).

It also means to lose weight; to slim.

How 痩せる conjugates · ichidan verb

Drop the る, then add the ending.

Nothing else moves: every ending attaches straight to the stem 痩せ. That is what makes ichidan the easy class.

痩せる dropsstem + ending

痩せない痩せないnegative · I don't lose weight. 痩せます痩せますpolite present 痩せて痩せてte-form · I lose weight and … 痩せた痩せたpast · I lost weight. 痩せられる痩せられるpotential · I can lose weight. 痩せれば痩せればif · If I lose weight, ... 痩せよう痩せようvolitional · Let's lose weight.

No sound changes and no vowel rows. The catch is telling ichidan from godan: plenty of godan verbs end in る too.

N5 N tags give the JLPT level at which the game starts quizzing a form.

PLAIN

Form	Conjugation	Audio
present N5	痩せるやせる yaseru
past N5 I lost weight.	痩せたやせた yaseta
negative N5 I don't lose weight.	痩せないやせない yasenai
te-form N5 I lose weight and …	痩せてやせて yasete
past negative N4 I didn't lose weight.	痩せなかったやせなかった yasenakatta
volitional N4 Let's lose weight.	痩せようやせよう yaseyou
potential N3 I can lose weight.	痩せられるやせられる yaserareru
cond. ば N3 If I lose weight, ...	痩せればやせれば yasereba
cond. たら N3 When I lose weight, ...	痩せたらやせたら yasetara
passive N2 Someone loses weight on me.	痩せられるやせられる yaserareru
causative N2 I make someone lose weight.	痩せさせるやせさせる yasesaseru
imperative N1 Lose weight!	痩せろやせろ yasero

POLITE

Form	Conjugation	Audio
present N5	痩せますやせます yasemasu
past N5 I lost weight.	痩せましたやせました yasemashita
negative N5 I don't lose weight.	痩せませんやせません yasemasen
past negative N4 I didn't lose weight.	痩せませんでしたやせませんでした yasemasendeshita
volitional N4 Let's lose weight.	痩せましょうやせましょう yasemashou

ASPECT

Form	Conjugation	Audio
ている N4 I've lost weight.	痩せているやせている yaseteiru
ていた N4 I had lost weight.	痩せていたやせていた yaseteita
ています N4 I've lost weight.	痩せていますやせています yaseteimasu
ていました N4 I had lost weight.	痩せていましたやせていました yaseteimashita