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In this sentence, what is じゃねぇか ?

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up vote 4 down vote accepted

じゃねぇか is just a colloquial form of the tag question じゃないか.

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So じゃ here is not the colloquial of では as it usually is? – 5argon Aug 27 '14 at 12:51
Yes it is! じゃねえか comes from じゃないか, which is the colloquial contraction of ではないか? (in English they would be very similar to: ain't it, isn't it and is it not, respectively) – comeauch Aug 27 '14 at 12:58
What is derogatory about it? It is plain Kanto colloquial. – l'électeur Aug 27 '14 at 14:42
Oh... then I stand corrected, thx! – comeauch Aug 27 '14 at 14:53
Umm, are you still here? If you have time can you explain me why と particle is being used? "Before completion AND the color not extremely differ!" I must be doing this wrong somewhere. (It's a step-by-step artwork article. This is the 5th step, 05 : 完成) – 5argon Aug 27 '14 at 17:14

This doesn't only happen with じゃない > じゃねえ, but generally /ai/ > /ee/, like

きたない > きたねえ
やばい > やべえ
(食{た}べたい = ) 食{く}いたい > 食いてえ

As in the other answer, this is extremely informal and in the wrong context can easily be considered plain rude.

Xと違う = to differ from X
完成前 = before completion

Edit. For completeness, there's also

  • /ae/ > /ee/
    e.g. お前 > おめえ
  • /oi/ > /ee/
    e.g. すごい > すげえ
  • /ui/ > /ii/
    e.g. さむい > さみい, まずい > まじい
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