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Japanese Verb Groups

-Verb Categolizing from masu-form

-Verb Categolizing from dictionary-form

 

Conjugation Groups

Japanese verbs are categolozed into three groups according to thier conjugation patterns.
No matter what the conjugation form is, certain syllables are remained, which called "stem."
Depending on the stem, we can categoloze the verbs.

The stem ends in a consonant.
The stem ends in a vowel.
The verb conjugates irregularily.

  Verb groups The stem ends in a consonant The stem ends in a vowel Irregular conjugation
    To drink To eat To do
a Nai-form Nom-anai Tabe-nai Shinai
i Masu-form Nom-imasu Tabe-masu Shimasu
u Dictionary form Nom-u Tabe-ru Suru
e Potential form Nom-eru Tabe-rareru Dekiru
o Vollitional form Nom-oo Tabe-yoo Shiyoo

Terminology
Japanese textbooks and dictionaries use several names for the three verb groups.

U-verbs/ Consonant-verbs/ Consonant-stem-verbs/ Group1 verbs/ Regullar1 verbs
Godankatsuyoo-verbs/ Godan-verbs/ Strong-verbs

Ru-verbs/ Vowel-verbs/ Vowel-stem-verbs/ Group2 verbs/ Regullar2 verbs
Ichidankatsuyoo-verbs/ Ichidan-verbs/ Weak-verbs

Irregular Verbs
SA-row irregular verb (for Suru)
KA-row irregular verb (for Kuru)

 

In this website, the following names are used for three verb groups, which are based
on the Dictionary forms.

  The stem ends in a consonant The stem ends in a vowel Irregualr conjugations
Names U-verbs RU-verbs Irregular verbs
Dictionary form (ex) Nom-u (ex) Tabe-ru Suru and Kuru

 

--> How can we categoloze a verb?
From Dictionary-form
From Masu-form

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