Japanese Verb & Adjective Conjugation Practice (Free, Interactive)

A free interactive Japanese conjugation trainer: see the dictionary form, type the requested form (te-form, ta-form, nai-form, potential, masu-form), and get instant feedback with rule explanations. Ideal for JLPT N5-N3 learners building a solid conjugation base.

The Three Japanese Verb Groups

• Godan (u-verbs): conjugate by the final kana, e.g. 書く→書いて, 読む→読んで.
• Ichidan (ru-verbs): drop る and attach, e.g. 食べる→食べて.
• Irregular: する→して/した/しない/できる; 来る→来て/来た/来ない/来られる.

Godan te-form / ta-form Sound Changes

• う・つ・る to って/った
• む・ぶ・ぬ to んで/んだ
• く to いて/いた (exception: 行く→行って)
• ぐ to いで/いだ
• す to して/した

Other Common Forms

• nai-form (negative): Godan final u-row to a-row + ない; Ichidan drop る + ない.
• potential form: Godan final u-row to e-row + る; Ichidan drop る + られる.
• i-adjectives: te-form →くて, past →かった, negative →くない (いい is irregular →よくて).

For full explanations see the Grammar Hub; to drill more, visit the JLPT Challenge (10,000+ free questions).

How the drill works

Each round shows a verb in its dictionary form and asks for one specific form. Type it, submit, and you get immediate feedback together with the rule behind it. Because rounds are generated rather than read off a fixed list, the conjugation exercise never runs out — you can keep going until the form stops feeling like guesswork.

Most learners use this verb drill alongside reading about the rule: understand it once, then practise here until it comes out automatically. It is free, needs no account, and your personal learning profile stays on your own device (de-identified answer statistics help calibrate question difficulty — opt out any time in our privacy policy).