質問: I was taught that these two phrases are interchangeable and have the same meaning. However, I recently wrote a few practice sentences using this grammar point and they were corrected to use ずには instead of ないでは The sentences I wrote were: > > 1. 知り合いにそっくりだったので、話しかけ**ないでは**いられなかった。 > 2. まだ子供なので、許さ**ないでは**いられなかった。 > > > However, both of these were corrected to: > > 1. 知り合いにそっくりだったので、話しかけ**ずには**いられなかった。 > 2. まだ子供なので、許さ**ずには**いられなかった。 > > > I was under the impression that both were acceptable and can't find anything stating otherwise. Is there something in particular with these sentences that they can only use ずには? Or am I completely missing something?
回答: I would think it would be degree of politeness/formality where ずに seems more polite/formal.