Japanese Verb Conjugation: Present, Past & Negative Forms

 Verb conjugation is one of the most essential aspects of learning Japanese. Unlike English, Japanese verbs do not change based on the subject (e.g., "I eat" vs. "He eats"), but rather by tense (present, past) and formality (casual, polite).

In this guide, we will explore:
Types of Japanese Verbs (Groups 1, 2, and Irregular)
Present tense (polite & casual)
Past tense (polite & casual)
Negative forms
Additional conjugations (て-form, potential, volitional, etc.)


Japanese Verb Conjugation

1. Types of Japanese Verbs

Japanese verbs are categorized into three main groups based on how they conjugate:

📌 Group 1 (Godan Verbs)

  • Ends in "-u" (書く kaku – to write, 話す hanasu – to speak)

  • The stem changes when conjugated.

📌 Group 2 (Ichidan Verbs)

  • Ends in "-iru" or "-eru" (食べる taberu – to eat, 見る miru – to see)

  • Drop "-ru" and add endings directly.

📌 Irregular Verbs

  • Only two irregular verbs in Japanese:

    • する (suru) – to do

    • 来る (kuru) – to come

  • These have unique conjugations and must be memorized separately.


2. Present Tense (Polite & Casual)

The present tense in Japanese is used for habitual actions or future events.

✅ Group 1 (Godan) – Change "-u" to "-imasu" (polite)

Dictionary (Casual)

Polite Form

書く (kaku) – to write

書きます (kakimasu)

飲む (nomu) – to drink

飲みます (nomimasu)

話す (hanasu) – to speak

話します (hanashimasu)

✅ Group 2 (Ichidan) – Drop "-ru" and add "-masu"

Dictionary (Casual)

Polite Form

食べる (taberu) – to eat

食べます (tabemasu)

見る (miru) – to see

見ます (mimasu)

✅ Irregular Verbs

Dictionary (Casual)

Polite Form

する (suru) – to do

します (shimasu)

来る (kuru) – to come

来ます (kimasu)


3. Past Tense (Polite & Casual)

To form the past tense, change "-masu" to "-mashita" for polite form or use "ta-form" for casual speech.

✅ Group 1 (Godan)

Dictionary (Casual)

Polite Past

Casual Past (Ta-form)

書く (kaku) – to write

書きました (kakimashita)

書いた (kaita)

飲む (nomu) – to drink

飲みました (nomimashita)

飲んだ (nonda)

話す (hanasu) – to speak

話しました (hanashimashita)

話した (hanashita)

✅ Group 2 (Ichidan)

Dictionary (Casual)

Polite Past

Casual Past (Ta-form)

食べる (taberu) – to eat

食べました (tabemashita)

食べた (tabeta)

見る (miru) – to see

見ました (mimashita)

見た (mita)

✅ Irregular Verbs

Dictionary (Casual)

Polite Past

Casual Past (Ta-form)

する (suru) – to do

しました (shimashita)

した (shita)

来る (kuru) – to come

来ました (kimashita)

来た (kita)


4. Negative Forms (Polite & Casual)

To form the negative, change "-masu" to "-masen" (polite) or use "-nai" (casual).

✅ Group 1 (Godan)

Dictionary (Casual)

Polite Negative

Casual Negative

書く (kaku)

書きません (kakimasen)

書かない (kakanai)

飲む (nomu)

飲みません (nomimasen)

飲まない (nomanai)

✅ Group 2 (Ichidan)

Dictionary (Casual)

Polite Negative

Casual Negative

食べる (taberu)

食べません (tabemasen)

食べない (tabenai)

見る (miru)

見ません (mimasen)

見ない (minai)

✅ Irregular Verbs

Dictionary (Casual)

Polite Negative

Casual Negative

する (suru)

しません (shimasen)

しない (shinai)

来る (kuru)

来ません (kimasen)

来ない (konai)


5. Additional Verb Forms

📌 て-form (Used for requests, linking verbs, and forming continuous tense)

Dictionary Form

て-form

書く (kaku)

書いて (kaite)

飲む (nomu)

飲んで (nonde)

食べる (taberu)

食べて (tabete)

する (suru)

して (shite)

来る (kuru)

来て (kite)

📌 Potential Form (Can do)

Dictionary Form

Potential Form

書く (kaku)

書ける (kakeru)

飲む (nomu)

飲める (nomeru)

食べる (taberu)

食べられる (taberareru)

する (suru)

できる (dekiru)

来る (kuru)

来られる (korareru)

📌 Volitional Form (Let's do something)

Dictionary Form

Volitional Form

書く (kaku)

書こう (kakou)

食べる (taberu)

食べよう (tabeyou)

する (suru)

しよう (shiyou)


FAQs About Japanese Verb Conjugation

  1. What’s the fastest way to learn verb conjugations?
    → Use flashcards, write sentences, and practice daily conversations.

  2. Why are some verbs irregular?
    → する (suru) and 来る (kuru) evolved differently from regular verbs.

  3. How do I know if a verb is Group 1 or 2?
    → If it ends in "-iru" or "-eru," it's likely Group 2 (Ichidan). Otherwise, it's Group 1 (Godan).

  4. What’s the difference between masu-form and dictionary form?
    → Masu-form is polite (e.g., 食べます), while dictionary form is casual (e.g., 食べる).

  5. How do I conjugate Japanese verbs into the negative form?
    → For Group 1, change the -u ending to -anai (e.g., 書く → 書かない).
    → For Group 2, drop る and add ない (e.g., 食べる → 食べない).
    → Irregular: する → しない, 来る → 来ない.


Mastering Japanese verb conjugation takes practice and repetition. Start with common verbs and gradually expand your vocabulary. The more you use these forms, the more natural they’ll become! 


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