|sci.lang.japan FAQ / 2. Grammar / 2.1. Verbs|
There are two kinds of regular verb in Japanese. One kind, "consonant stem", "group I" or, in Japanese, godan verbs, conjugates such that the rightmost unchanging element is a consonant. For example, iku (to go) conjugates as ikeru, ikinasai, ikanai, ikou. The other group, "vowel stem", "group II", or, in Japanese, ichidan verbs, conjugates such that the rightmost unchanging element is a vowel. For example, taberu (to eat) conjugates as taberareru, tabenasai, tabenai, tabeyou.
|Form||Group I||Group II|
The vowel stem verbs all end in -iru or -eru. However, not all verbs that end in -iru or -eru are vowel stem verbs. The next answer ( 2.1.3. Which iru and eru verbs are actually group I (consonant) verbs?) gives some rules and a list of the odd ones out.
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