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The [Tanos JLPT
list](http://www.tanos.co.uk/jlpt/skills/grammar/sentences/?grammarid=516)
contains this sentence:

> ディズニーランドはとても面白かったよ。君もこればよかったのに。 Disneyland was very interesting. You should
> have come with us.

But [the accepted answer at Chiebukuro for
『よかったら、一緒に来れば？』と誰かを誘ったりするときの「来れば？」ですが、...](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1327605988)
says:

> 東北辺りでは これば？と言う人もいます  
>  方言の一種ですね  
>  読み仮名を付ける場合は「くれば」しかありません

Also, my IMEs refuse to convert これば into 来れば, and Rikaichan does not give any
meaningful translation for これば.

Is there a contradiction, or am I misunderstanding something?

Is 来ればよかった correct?  
Is こればよかった correct?

If there are several definitions of "correct", I am interested in what JLPT
deems "correct".
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question
conjugations
Is こればよかった correct or not?
I think the correct form in standard Japanese is [来]{く}ればよかったのに, since
[Wiki](http://ja.wikipedia.org/wiki/%E3%82%AB%E8%A1%8C%E5%A4%89%E6%A0%BC%E6%B4%BB%E7%94%A8)
says 仮定形 of 来る is くれ.

I think こればよかったのに is a typo or an error. Maybe the person who wrote this uses
a regional dialect and typed これば (unconsciously or carelessly?), and it was
not converted into kanji so they just left it as it was.
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The answer up there you posted seems to make it seem pretty clear to me.

```

    東北辺りでは これば？と言う人もいます
    方言の一種ですね
    読み仮名を付ける場合は「くれば」しかありません
    
```

is translated to:

```

    Around Touhoku, there are some people who say 「これば」.
    It's just one type of local dialect. 
    But when you write it down, the only correct way is 「くれば」。
    
```

So in other words, if you are in 東北 and say 「これば」you will be understood just
like you can replace 「だ」 with 「や」 in 関西 , but for the JLPT or whenever you're
writing formal Japanese, it has to be the Tokyo dialect 「くれば」.
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Classic ら抜き + れ抜き (In other words it's a mistake!)

```

    これる ==　こられる
    
    これば == こられれば
    
```

However, 「これる」is in the 大辞林 as meaning "being able to come". Though it does
make the note that the "original" (read correct) form is 「こられる」.

<http://www.weblio.jp/content/%E6%9D%A5%E3%82%8C%E3%82%8B>

To sum up, ら抜き言葉 is awesome. But れ抜き言葉 is not. I mean which would you rather
say, "koreba" or "korarereba"? I don't have time for that. No, wait... Yes I
do! Maybe I'll just go with 「これれば」。
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