Japanese Verb Conjugation Table
According to Waapuro-style Hepburn Romanization

By John Herr

Verb Type

Te-form

Past

Negative

Causative

Passive

Potential

Conditional

Volitional

I-form

Imperative

Polite Mood

Ru-Dropping (Ichidan)

+te

+ta

+nai

+saseru

+rareru

+rareru

+reba

+you

(no additions)

+ro / +yo

+masu

U-Dropping (Godan)

Ending

Drop Consonant First

Leave Consonant

S

+shite

+shita

+anai

+aseru

+areru

+eru

+eba

+ou

-s, +shi

+e

-s, +shimasu

K

+ite

+ita

+i

+imasu

G

+ide

+ida

N

+nde

+nda

B

M

R

+tte

+tta

T(-s)

-t, +chi

-t, +chimasu

W

-w, +eru

-w, +eba

-w, +ou

-w, +i

-w, +e

-w, +imasu

Irregular (Fukisokudoushi)

kuru

kite

kita

konai

kisaseru

korareru

korareru

kureba

koyou

ki

koi

kimasu

suru

shite

shita

shinai

saseru

sareru

dekiru

sureba

shiyou

shi

shiyo / seyo

shimasu

iku

itte

itta

aru

nai

(not used)

irassharu

irashite

irashita

*

*

*The honorific verbs irassharu, kudasaru, nasaru, gozaru, and ossharu, though godan verbs, omit the last r after forming their imperative or polite forms.
Ex.: irassharu > irasshae, irasshaimasu; ossharu > osshae, osshaimasu

The verb tou meaning "to ask," though a godan verb, uses toute and touta for its te and past forms.

The verb kureru meaning "to give," though an ichidan verb, uses kure for its imperative form.