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Verb Conjugation by Form

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1. Dictionary Form (基本形)

Casual present/future / Habitual action / Foundation for other rules

Ru-Verb (る動詞)
taberu to eat
U-Verb (う動詞)
nomu to drink
Irregular (する)
suru to do
Irregular (くる)
kuru to come

2. Masu Form (ます形)

Polite present/future / Safe to use with strangers and teachers

-masu (Drop る)
tabemasu eat / will eat
-imasu (u -> i)
nomimasu drink / will drink
Irregular (する)
shimasu do / will do
Irregular (くる)
kimasu come / will come

3. Te Form (て形)

Requests (-te kudasai) / Connecting actions (and then) / Present continuous (-te imasu)

-te (Drop る)
tabete eat and...
-nde (mu -> nde)
nonde drink and...
Irregular (する)
shite do and...
Irregular (くる)
kite come and...

4. Nai Form (ない形)

Casual negative / "Please don't" (-nai de kudasai) / "Must do" (-nakereba narimasen)

-nai (Drop る)
tabenai do not eat
-anai (u -> a)
nomanai do not drink
Irregular (する)
shinai do not do
Irregular (くる)
konai do not come

5. Ta Form (た形)

Casual Past tense / "Have experienced" (-ta koto ga arimasu)

-ta (Drop る)
tabeta ate
-nda (mu -> nda)
nonda drank
Irregular (する)
shita did
Irregular (くる)
kita came

6. Potential Form (可能形)

"Can do" or "Are able to do" an action

-rareru (Drop る)
taberareru can eat
-eru (u -> e)
nomeru can drink
Irregular (する)
dekiru can do
Irregular (くる)
korareru can come

7. Provisional Conditional (~eba 形)

"If..." / Logical consequence or requirement

-reba (Drop る)
tabereba if (I) eat
-eba (u -> e)
nomeba if (I) drink
Irregular (する)
sureba if (I) do
Irregular (くる)
kureba if (I) come

8. Conditional (~tara 形)

"If..." / "When..." / Most versatile conditional form

-tara (From Ta-form)
tabetara if/when (I) eat
-dara (From Ta-form)
nondara if/when (I) drink
Irregular (する)
shitara if/when (I) do
Irregular (くる)
kitara if/when (I) come

9. Passive (受身形)

"To be [verb]-ed" / Used for actions happening to you

-rareru (Drop る)
taberareru to be eaten
-areru (u -> a)
nomareru to be drunk
Irregular (する)
sareru to be done
Irregular (くる)
korareru to be come

10. Causative (使役形)

"To make/let someone do..."

-saseru (Drop る)
tabesaseru make (someone) eat
-aseru (u -> a)
nomaseru make (someone) drink
Irregular (する)
saseru make (someone) do
Irregular (くる)
kosaseru make (someone) come