Can we use negative form before ～てしまう : f.ex. なく+～てしまう？


Using the form **～てしまう** we mean, that something happened in a way we did not
expect. But what if we use a negative form before the **～てしまう** ending? Will
it be also grammatically right?

For example:

> 昨日メッセージを書いていなくてしまいました。




なくて doesn't connect to しまう but ないで does, in other words, you can say
昨日、メッセージを書かないでしまった.

(Technically, 書いていないでしまった is possible but that sounds very awkward. On the
other hand, 書かないでいてしまった is fine though I still can't see the point to use it
here.)




なくて doesn't connect to しまう but ないで does, in other words, you can say
昨日、メッセージを書かないでしまった.

(Technically, 書いていないでしまった is possible but that sounds very awkward. On the
other hand, 書かないでいてしまった is fine though I still can't see the point to use it
here.)

