日本語のおしゃべり

Japanese Language
「Sentence Structure」

The te form of a verb, followed by the verb shimasu ("finish," "put away"), expresses with emphasis the completion of an action and, in some cases, may imply a sense of regret for an action one has taken or an event that has occurred. Shimasu here is used as an auxiliary.

Examples:
彼は一年でその小説を書いてしまった。
Kare wa ichi-nen de sono shōsetsu o kaite shimatta.
He finished writing that novel in one year.

隆はクッキーをみんな食べてしまいました。
Takeshi wa kukkī o minna tabete shimaimashita.
Takashi ate up all the cookies.

すっかり宿題を忘れてしまった。
Sukkari shukudai o wasurete shimatta.
I have completely forgotten (to do) my homework.

Hope this helps!

じゃまたね！

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