The form of the verb you'll find in the dictionary. In Romaji it always ends in "u"; e.g. "taberu", "iku", "arau" etc.
In Japanese script verbs in the dictionary form always end in a hiragana character that makes a "u" sound:
る, く, う, ぐ, ぬ, む, す and つ.
How does the conjugator work?
Romaji: The conjugator will conjugate any Romaji text that looks like a Japanese verb - ends in "u" basically.
Kanji/Hiragana: The conjugator will conjugate Japanese text providing it matches an entry on our database.
The contents of the database can be viewed on the list of verbs page. If you want to
conjugate a verb that isn't on the list let us know!