Can you help me? で or に?
電車（・・・）かばんを忘れてしまいました。
instead of　(・・・) what should I write で or に ?
Thank you )

Question

Answer

I think both are correct, but に is more natural than で.
電車(に)かばんを忘れてしまいました。
-->  I left my bag in the train.
電車(で)かばんを忘れてしまいました。
-->  I left my bag at the train.

Japanese particle like "で" and "に" is tiny problem in sentences ;)

Answer

電車(に)かばんを忘れてしまいました
＝I forgot to take my bag. (I leave my bag in the train.)
if you want to say this, に is right one :)

Answer

で, because  '電車 ' is a trafic. And で means by some trafic.

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yeah, I want to use it like a definite statement. " I've left my bag "

Answer

This problem is you want use this sentence for difinate statement or not.