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```

    一階で寝てたはずじゃ
    
```

This sentence is from episode 21 of "Mirai Nikki". The context is that the
protagonist is a bit surprised to find the other character sleeping on the
second floor.

I know that んじゃ／のでは can be used in questions as an abbreviation of のではないか, but
can just じゃ also be used as an abbreviation of じゃない with nouns? Is it widely
used like this? I think I have listened to that quite a lot especially when
the characters are speaking fast, but I'm not sure.
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question
anime
What it is the meaning of じゃ in 一階で寝てたはずじゃ?
Yes, you're right. じゃ is a colloquial variant of では, and では can follow not
only の but also any noun and noun-like words (including はず), and implicit ないか
may follow. For example, you can say 「これは本では？」(Isn't this a book?) and
「それは簡単では？」(Isn't that easy?).
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answer