Basic Verb Conjugation
There are three categories of verbs in Japanese: ru-verbs, u-verbs, and irregular verbs. Ru and u verbs follow regular conjugation:
verb bases tabe iku
dictionary forms たべる (to eat) いく(to go)
present, affirmative たべます いきます
present, negative たべません いきません
stems たべ いき
There are only two irregular verbs in Japanese: する and くる. They are cojugated as follows:
dictionary forms する くる
present, affirmative します きます
present, negative しません きません
stems し き
Ru-verbs are so called because you add the suffix ru to the verb base to form the dirctionary form.
U-verbs can be broken down into the base and the suffix. The long form are formed with the base plus suffixes imasu and imasen.