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N4

Finishing / Regret: 〜てしまう

Use 〜てしまう both for total completion and for actions or results the speaker regrets, notices, or sees as unfortunate.

Recognize the two main meanings of 〜てしまう: completion and regret.Read casual contracted forms such as 〜ちゃう and 〜じゃう.Understand speaker attitude when 〜てしまう appears in dialogue and narration.
Guided study

Completion: doing something fully

One use of 〜てしまう is simple completion. It can mean that something is finished completely, sometimes faster than expected or with a sense of finality.

宿題を全部やってしまった。

I finished all of my homework.

Completion with a sense that the action is fully done.

この本は一日で読んでしまえる。

I can finish this book in one day.

Potential-style usage: able to finish completely.

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