Japanese Verb Conjugation: Patterns, Groups and Practice

The Three Verb Groups

Japanese verbs divide into three groups that determine how they conjugate. Group 1 (godan/u-verbs) includes most verbs ending in -u sounds: 書く (kaku, write), 話す (hanasu, speak), 飲む (nomu, drink), 待つ (matsu, wait). Group 2 (ichidan/ru-verbs) includes verbs ending in -iru or -eru: 食べる (taberu, eat), 見る (miru, see), 起きる (okiru, wake up). Group 3 contains only two irregular verbs: する (suru, do) and 来る (kuru, come). Identifying a verb’s group is the first step to conjugating it correctly.

The tricky part is that some verbs look like Group 2 but actually belong to Group 1. 帰る (kaeru, return), 走る (hashiru, run), and 切る (kiru, cut) all end in -iru or -eru but conjugate as Group 1. There is no foolproof rule for these exceptions — learners simply memorize them. Textbooks like Genki mark verb groups in vocabulary lists, and after encountering enough examples, the pattern becomes intuitive.

Masu Form: Polite Present and Future

The masu form (ます形) is typically the first conjugation learners master because it handles polite speech in everyday situations. For Group 1 verbs, the final -u syllable shifts to the -i row before adding ます: 書く becomes 書きます (kakimasu), 飲む becomes 飲みます (nomimasu), 話す becomes 話します (hanashimasu). Group 2 verbs simply drop る and add ます: 食べる becomes 食べます (tabemasu), 見る becomes 見ます (mimasu). The irregulars become します (shimasu) and 来ます (kimasu).

Negative polite form replaces ます with ません: 書きません (kakimasen, do not write), 食べません (tabemasen, do not eat). Past polite adds した: 書きました (kakimashita, wrote), 食べました (tabemashita, ate). Past negative polite: 書きませんでした (kakimasen deshita, did not write). These four forms — present affirmative, present negative, past affirmative, past negative — cover the majority of polite conversation.

Te Form: The Essential Connector

Te form (て形) links verbs to other grammatical structures and is arguably the most important conjugation to master. Group 1 verbs follow sound-based patterns: verbs ending in く become いて (書く to 書いて, kaite), verbs ending in ぐ become いで (泳ぐ to 泳いで, oyoide), verbs ending in す become して (話す to 話して, hanashite), verbs ending in む/ぶ/ぬ become んで (飲む to 飲んで, nonde). Group 2 verbs drop る and add て: 食べて (tabete), 見て (mite). Irregulars: して (shite) and 来て (kite).

Te form enables requests (窓を開けてください, mado wo akete kudasai — please open the window), ongoing actions with いる (食べている, tabete iru — is eating), sequential actions (朝ごはんを食べて学校に行く, asagohan wo tabete gakkou ni iku — eat breakfast and go to school), and permission with もいい (写真を撮ってもいいですか, shashin wo totte mo ii desu ka — may I take a photo?). Mastering te form unlocks a wide range of natural expression.

Casual and Plain Forms

Plain form (辞書形, jisho-kei, dictionary form) appears in casual conversation among friends, in subordinate clauses, and before grammatical patterns. Where polite speech uses 食べます, casual speech uses 食べる. Past plain: 食べた (tabeta). Negative plain: 食べない (tabenai). Past negative plain: 食べなかった (tabenakatta). For Group 1, the negative replaces the final -u with -anai: 書く becomes 書かない (kakanai), 飲む becomes 飲まない (nomanai).

Japanese conversation constantly shifts between politeness levels. Speaking to a shop clerk at a konbini, you use masu form. Chatting with coworkers at a casual izakaya after work, plain form dominates. Addressing a senior colleague in a meeting, keigo (敬語, honorific language) layers additional conjugations on top. The verb 食べる alone has at least four politeness levels: 食べる (casual), 食べます (polite), 召し上がる (meshiagaru, honorific), and いただく (itadaku, humble).

Conditional, Volitional, and Potential

Conditional forms express “if” statements. The -ba form changes the final vowel: 書けば (kakeba, if you write), 食べれば (tabereba, if you eat). The -tara form adds ら to the past tense: 書いたら (kaitara), 食べたら (tabetara). The volitional form suggests “let’s” or expresses intention: 書こう (kakou, let’s write), 食べよう (tabeyou, let’s eat), しよう (shiyou, let’s do it). This form appears on signs throughout Japan — 日本語を話そう (nihongo wo hanasou, let’s speak Japanese).

Potential form means “can do.” Group 1 verbs shift the final syllable to the -e row and add る: 書ける (kakeru, can write), 読める (yomeru, can read). Group 2 verbs add られる: 食べられる (taberareru, can eat), though colloquial speech often drops the ら to produce 食べれる (tabereru), a form called ra-nuki kotoba that purists consider incorrect but most young Japanese speakers use daily. Mastering these forms takes months of practice, but each new conjugation pattern unlocks entire categories of expression that make conversation feel natural rather than scripted.

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