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(from "The Quick and Dirty Guide to Japanese Grammar" by Tad Perry)
 

IRREGULAR VERBS

Most books say that there are only two irregular verbs in all of Japanese: suru and kuru. You have to learn these two separately, but they kind of make sense.
 

KURU
 
    kuru "will come" or "comes often, everyday"
    ki to add "-masu", note that "-yasui" isn't used
    kite casual command: "come here"
    kita past tense: "someone came"
    kitara add ra to past tense:
"if/once someone comes", some connotation of "when"
    kitari add ri to past tense: "do things like come"
    kureba "if someone comes": no connotation of "when"
    koyoo "let's come"
    koi rude request: "come here you"
    konai negative: "won't come" or "doesn't come (very much)"
    korareru "can come"
    kosaseru "make (someone) come"
    korareru passive form
    kosaserareru "be made to come (by someone)"

 

SURU
 
    suru "will do", or "does (often, everyday, etc.)"
    shi to add "-masu", or "-yasui"
    shite casual command: "do this"
    shita past tense: "someone did"
    shitara add -ra to past tense.
"if(once) someone does", some connotation of "when"
    X shitari add -ri to past tense: "do things like doing X"
    sureba "if someone does": no connotation of "when"
    X shiyoo "let's do X"
    shiro rude request: "do this dammit"
    shinai  negative: "won't do" or "doesn't do (very much)"
    dekiru really "seru": "can do"--"someone I can love": "ai seru hito"
    saseru "make (someone) do"
    sareru "be done (by someone)"
    saserareru "be made to do (by someone)"

A cool trick to remember suru is that many of the conjugations match what you would get if you conjugated a lone "su", so it's kind of like "hanasu":
 
    HANASU  SURU 
    hanashita  shita
    hanaseru  seru
    hanasaseru  saseru

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IKU

In fact, though, there's a third irregular verb: iku.
The reason is that unlike kiita for kiku, you don't say iita, you say itta.
And you don't say iite, you say itte.
But it's regular in it's irregularity because it acts like tsukuru for some weird reason.

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-RU VERBS (GROUP II)

-U VERBS (GROUP I)

ADJECTIVES

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