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て-Form + しまう as “completely VERBed” (with an emphasis on finality)

て-Form + しまう as “completely VERBed” (with an emphasis on finality)

The phrasing しまう is added after the て-Form of a verb to emphasize that the verb has completely occurred. This expression is almost entirely used to indicate a sense of regret because of the irrevocable resultant state that the completion of the verb has caused.

Example(s):
昨日私の犬が死んでしまいました
Kinou watashi no inu ga shinde shimaimashita.
(Yesterday my dog died.)

すみません。うっかり、家に宿題を忘れてしまいました
Sumimasen. Ukkari, uchi ni shukudai o wasureteshimaimashita.
(I’m sorry, I carelessly forgot my homework at home.)

勉強しないで寝てしまった
Benkyou shinaide neteshimatta.
(I fell asleep without studying.)