Godan verb (ぶ)

転ぶころぶ

korobu

to fall down · N3

転ぶ (ころぶ, korobu) — to fall down — is a godan verb ending in ぶ: 転んで (te-form), 転んだ (past), 転ばない (negative), 転びます (polite).

It also means to fall over.

How 転ぶ conjugates · godan ぶ-verb

Only the last kana changes: ぶ becomes ば, び, べ or ぼ.

Which one depends on the ending. The five are one line of the hiragana chart — same consonant, vowels あ・い・う・え・お — and everything before that kana never changes.

ば転ばないnegative

び転びますpolite present

ぶ転ぶdictionary form

べ転べるpotential転べばif

ぼ転ぼうvolitional

The て and た forms · ぶ → んで, んだん転んでte-form転んだpast

The て and た forms are the only two that don't follow this pattern. Every む-, ぶ- and ぬ-verb has the same んで there.

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

Aa Dimmed forms are too rare in everyday Japanese for the game to quiz.

PLAIN

Form	Conjugation	Audio
present N5	転ぶころぶ korobu
past N5 I fell down.	転んだころんだ koronda
negative N5 I don't fall down.	転ばないころばない korobanai
te-form N5 I fall down and …	転んでころんで koronde
past negative N4 I didn't fall down.	転ばなかったころばなかった korobanakatta
volitional N4	転ぼうころぼう korobou
potential N3 I can fall down.	転べるころべる koroberu
cond. ば N3 If I fall down, ...	転べばころべば korobeba
cond. たら N3 When I fall down, ...	転んだらころんだら korondara
passive N2	転ばれるころばれる korobareru
causative N2 I make someone fall down.	転ばせるころばせる korobaseru
imperative N1 Fall down!	転べころべ korobe

POLITE

Form	Conjugation	Audio
present N5	転びますころびます korobimasu
past N5 I fell down.	転びましたころびました korobimashita
negative N5 I don't fall down.	転びませんころびません korobimasen
past negative N4 I didn't fall down.	転びませんでしたころびませんでした korobimasendeshita
volitional N4	転びましょうころびましょう korobimashou

ASPECT

Form	Conjugation	Audio
ている N4 I've fallen down.	転んでいるころんでいる korondeiru
ていた N4 I had fallen down.	転んでいたころんでいた korondeita
ています N4 I've fallen down.	転んでいますころんでいます korondeimasu
ていました N4 I had fallen down.	転んでいましたころんでいました korondeimashita