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I found a sentence as follows.

体が丈夫でないことには、何もすることができない。

でない is the negation of である.

My question is that

Can we use either じゃない or ではない in addition to でない for the given sentence above?

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Yes you can say:

体が丈夫じゃないことには、何もすることができない。

But you cannot say:

体が丈夫ではないことには、何もすることができない。

Perhaps because は is already used after に.

Well, じゃ is explained as the "casual version of では", so I know it doesn't look consistent. I'm not sure, but maybe the "one wa per clause" rule can be loosened when じゃ is used?

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