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The hypothetical scenario is given as follows.

  • Yesterday night I played game and intentionally did not do the homework. I did not forget for sure. :-)
  • This morning the teacher asked me and I want to pretend to regret what I did.

From this scenario, I want to say something that makes use of ~てしまいました grammar.

宿題を[the て form of しない]しまいました。

What is the て form of しない ?

  • It's しないでしまいました, but this usage is not common. – Yang Muye Jun 16 '15 at 4:44
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    これこれ は参考になりますか。 – Chocolate Jun 16 '15 at 5:43
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    I think you cannot use しまいました with ない形. You should instead use something like 宿題をしないで寝てしまいました。 – harsh.prasad Jun 16 '15 at 13:37
  • This question might give you a hint on how to excuse yourself, but anyway it would be hard to end with してしまいました, this would rather be a part of the reason like 宿題をしようとしましたが、〜してしまって、できませんでした。 – macraf Oct 24 '15 at 23:56
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しないで would be the て form of しない, but in conversation you don't hear the negative form of a verb used with しまいました. Instead you use the positive form of a verb + て form + しまいました. So for example, 宿題をしてしまいました would emphasize that you did your homework. If you didn't do the homework you need to connect it's negative with another verb. For example, 宿題をしないで来てしまいました。

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