Godan verb (う)

買うかう

kau

to buy · N5

Also read かう: 飼う (keep a pet). All 2 words

買う (かう, kau) — to buy — is a godan verb ending in う: 買って (te-form), 買った (past), 買わない (negative), 買います (polite).

It is transitive: it takes a direct object. It also means to purchase.

How 買う conjugates · godan う-verb

Only the last kana changes: う becomes わ, い, え or お.

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.

わ買わないnegative

い買いますpolite present

う買うdictionary form

え買えるpotential買えばif

お買おうvolitional

The て and た forms · う → って, ったっ買ってte-form買ったpast

The て and た forms are the only two that don't follow this pattern. Every う-, つ- and る-verb has the same って there.

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

PLAIN

Form	Conjugation	Audio
present N5	買うかう kau
past N5 I bought it.	買ったかった katta
negative N5 I don't buy it.	買わないかわない kawanai
te-form N5 I buy something and …	買ってかって katte
past negative N4 I didn't buy it.	買わなかったかわなかった kawanakatta
volitional N4 Let's buy it.	買おうかおう kaou
potential N3 I can buy it.	買えるかえる kaeru
cond. ば N3 If I buy one, ...	買えばかえば kaeba
cond. たら N3 If I buy it, ...	買ったらかったら kattara
passive N2 It gets bought.	買われるかわれる kawareru
causative N2 I make someone buy it.	買わせるかわせる kawaseru
imperative N1 Buy it!	買えかえ kae

POLITE

Form	Conjugation	Audio
present N5	買いますかいます kaimasu
past N5 I bought it.	買いましたかいました kaimashita
negative N5 I don't buy it.	買いませんかいません kaimasen
past negative N4 I didn't buy it.	買いませんでしたかいませんでした kaimasendeshita
volitional N4 Let's buy it.	買いましょうかいましょう kaimashou

ASPECT

Form	Conjugation	Audio
ている N4 I'm buying it.	買っているかっている katteiru
ていた N4 I was buying it.	買っていたかっていた katteita
ています N4 I'm buying it.	買っていますかっています katteimasu
ていました N4 I was buying it.	買っていましたかっていました katteimashita