This means something happened all by itself. It often shows you are surprised or unhappy about it.
Intransitive Verb [て-form] + しまうPrimary
This means something happened all by itself. It often shows you are surprised or unhappy about it.
うっかりして、電車の乗り換え駅を過ぎてしまった。
I wasn't paying attention and ended up going past my transfer station on the train.
もうすぐ桜が全部散っちゃうね。
The cherry blossoms will all have fallen soon, won't they?
このままだと、バッテリーがなくなってしまいませんか？
If things continue like this, won't the battery completely die?
道に迷ってしまったので、会議に遅れました。
Because I got completely lost, I was late for the meeting.
夢中で本を読んでいたら、いつの間にか夜が明けてしまった。
I was so absorbed in my book that before I knew it, the dawn had broken.
This grammar can show you feel bad about something. It can also just mean something finished completely. Like a baby falling asleep. The situation tells you which meaning it is.
This is for things that happen by themselves. For example, 'The door opened by itself.' The other 'te shimau' is for things you do. For example, 'I opened the door by mistake.'
Use this when you want to sound casual. You can shorten "~te shimau" to "~chau". You can shorten "~de shimau" to "~jau". This makes your speech sound more natural. For example, "wasurete shimau" becomes "wasurechau". This means "to forget completely". "Shinde shimau" becomes "shinjau". This means "to die". The polite form does not have a short version.
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