Meaning and Usage
The grammar pattern ～(て)しまう is used to express that an action has been completed, often with a nuance of regret, accident, or finality. It can indicate that something happened unintentionally or that the speaker feels sorry about the result.
Common Contexts
- Expressing regret or unintended actions: 宿題を忘れてしまった (I ended up forgetting my homework).
- Indicating completion of an action, sometimes with a sense of finality: ケーキを全部食べてしまった (I ate all the cake).
- Describing unfortunate outcomes: 電車に乗り遅れてしまいました (I missed the train).
Common Collocations and Patterns
- ～てしまう (plain form): used in casual speech.
- ～てしまいました (polite form): polite version.
- Often combined with verbs of forgetting, losing, missing, or finishing.
Usage Tips
This pattern often conveys the speaker's feelings about the action, such as regret or surprise. It is important not to confuse it with simple past tense; ～てしまう adds emotional or aspectual nuance. Learners sometimes omit this pattern and lose the nuance of regret or completeness.
Register
Used in both casual and polite speech, depending on the verb ending (しまう vs しまいました). It is common in everyday conversation.