I came across a sentence that has puzzled me.

> 今度ばかりはいたずら **では** 済まされません｡

Why is **では** used here?
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2020-10-21T18:59:02.393
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question
grammar particles
Why is では used here? What does it do to the meaning of this sentence?
～ **で** 済む is a set phrase that means "to get away with ～".

> これで済んだと思うなよ。  
>  You won't get away with this.
>
> ここから落ちたら怪我では済まない。  
>  If you fall from here, you can't just get hurt and survive.

いたずらで済ませる means "to get away calling it a prank", "to forget thinking of it as
a prank", etc. は is used because it's a negative sentence (see: [Why is the
topic marker often used in negative statements (ではない,
～とは思わない)?](https://japanese.stackexchange.com/q/1077/5010)).
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2020-10-22T00:53:07.367
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My student just asked me 2 grammars. "～で済む" and "～ないで済む" can be translated as
"get by doing something/done by something"

> 今度ばかりはいたずらでは済まされません｡  
>  => It can not be done by a joke.

では was used but not で because は is used to show the meaning which is similar
to ほど. 強調という役割で使われています。
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2020-10-22T03:13:45.097
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