Japanese Verb Conjugator: Godan, Ichidan and Irregular
Conjugate Japanese verbs into 12 useful forms including polite, negative, past, te-form, potential, passive, causative, volitional, and conditional.
Conjugate a Japanese verb
Enter the dictionary form, choose its group, and compare polite, negative, past, te, potential, passive, and causative forms.
Some verbs ending in る are Godan, not Ichidan. Choose the dictionary group from a reliable dictionary when uncertain. Honorific forms and every lexical exception are outside this compact reference.
The three Japanese verb groups
Godan verbs change their final Kana across the a-, i-, e-, and o-rows. Ichidan verbs usually remove the final る before adding an ending. The central irregular verbs are する and 来る.
Why the group selector matters
Not every verb ending in る is Ichidan. 食べる is Ichidan, while 帰る is Godan. A spelling-only guess can be wrong, so confirm an unfamiliar verb in a dictionary and select the correct group.
Learn forms in a useful order
Begin with dictionary, polite, negative, past, and te-form. Add potential and volitional next. Passive and causative become more important as sentences grow more complex. Compare several verbs from the same group to see the reusable pattern.
Practice beyond a chart
A conjugation table shows forms but not when each one is natural. Use the generated form in a full sentence, then test sentence choice with the JLPT Grammar Quiz.