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Definitions

• (grammar) a verbal conjugation class in which the verb stem ends in -i and consists of four alternating bases: -i, -iru, -ire and -iyo/-iro {| class="wikitable" |- ! ! 未然形 (未然形)Irrealis ! 連用形 (連用形)Adverbial ! 終止形 (終止形)Conclusive ! 連体形 (連体形)Attributive ! 仮定形 (仮定形)Conditional ! 命令形 (命令形)Imperative |- ! 着る (to wear) | 着 (tr=ki) | (tr=ki) | (tr=kiru) | (tr=kiru) | (tr=kire) | (tr=kiyo) (tr=kiro) |- ! 閉じる (to close) | (tr=toji) | (tr=toji) | (tr=tojiru) | (tr=tojiru) | (tr=tojire) | (tr=tojiyo) (tr=tojiro) |- ! 似る (to resemble) | 似 (tr=ni) | (tr=ni) | (tr=niru) | (tr=niru) | (tr=nire) | (tr=niyo) (tr=niro) |- ! 伸びる (to extend) | 伸び (tr=nobi) | (tr=nobi) | (tr=nobiru) | (tr=nobiru) | (tr=nobire) | (tr=nobiyo) (tr=nobiro) |- ! 見る (to see) | 見 (tr=mi) | (tr=mi) | (tr=miru) | (tr=miru) | (tr=mire) | (tr=miyo) (tr=miro) |- ! 降りる (to descend) | (tr=ori) | (tr=ori) | (tr=oriru) | (tr=oriru) | (tr=orire) | (tr=oriyo) (tr=oriro) |- ! ! (未然形)Irrealis ! (連用形)Adverbial ! (終止形)Conclusive ! (連体形)Attributive ! 已然形 (已然形)Realis ! (命令形)Imperative |- ! (to wear) | (1 → ki) | (1 → ki) | (1ru → kiru) | (1ru → kiru) | (1re → kire) | (2 → kiyo) |- ! (to resemble) | (tr=ni) | (tr=ni) | (tr=niru) | (tr=niru) | (tr=nire) | (tr=niyo → niyo) |- ! (to see) | (tr=mi → mi) | (tr=mi → mi) | (tr=miru → miru) | (tr=miru → miru) | (tr=mire → mire) | (tr=mi → miyo) |} The subscripts in the table above indicate differences in vowel class that were already being lost in . It remains unclear what those different vowel classes may have meant. See for more details.