Struggling with complex grammar charts? Learn the logical rules behind the three verb families to conjugate Japanese words with confidence and ease.

Japanese verb conjugation is actually one of the easiest things about the language. Unlike English, where we have dozens of irregulars, Japanese only has two truly irregular verbs in the entire language.
To identify a verb's group, you use a simple elimination process starting with its dictionary form, which always ends in an "u" sound. First, check if it is one of the two irregular verbs: suru (to do) or kuru (to come). If it is not irregular, perform the "Ru-Test" by looking at the last syllable; if the verb does not end in ru, it is automatically a Godan verb. If it does end in ru, look at the vowel sound immediately preceding it; if you hear an "i" or "e" sound (the i-ru or e-ru pattern), it is typically an Ichidan verb.
The vowel shift is a logical five-step system used to conjugate Godan verbs by sliding the final "u" vowel to different rows on the hiragana chart. For example, to create the polite masu form, you shift the final "u" sound to an "i" sound (e.g., kaku becomes kaki-masu). To make the negative nai form, you shift it to the "a" row (e.g., kaku becomes kaka-nai). For the potential form, you shift to the "e" row (kakeru), and for the volitional "let's" form, you shift to the "o" row (kakou).
The te-form is essential because it acts as a linguistic bridge, allowing speakers to connect multiple ideas and sentences together. Beyond just linking actions, it is the foundation for making requests (using kudasai), expressing ongoing progressive actions (using iru), and asking for permission. Furthermore, mastering the te-form provides a "two-for-one" benefit because the rules for the plain past tense (ta-form) are identical; you simply swap the "e" sound for an "a" sound.
Imposter verbs are a small group of verbs (about 5%) that appear to be Ichidan because they end in i-ru or e-ru, but actually conjugate as Godan verbs, such as kaeru (to return) or hairu (to enter). A helpful visual tip is the "Kanji-Kana" rule: if a verb consists of a single kanji followed only by the kana ru, it is likely a Godan exception. In contrast, true Ichidan verbs like taberu usually have an extra hiragana character (like be) visible between the kanji and the final ru.
The "promotion" rule refers to the fact that once a Godan verb is conjugated into a complex form—such as the potential, passive, or causative—the resulting verb ends in ru and functions exactly like an easy Ichidan verb. For instance, once the Godan verb kaku (to write) is shifted to the potential kakeru (can write), it follows the simple "drop-and-add" rules for all further transformations. This modular system allows learners to stack rules, such as adding polite or negative endings, without having to perform multiple difficult vowel shifts.
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