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LingakuLingaku[verb て-form] + しまう
Casual contractions:
The grammar structure ～てしまう expresses two main ideas: completing an action fully and doing something unintentionally or with regret. Which meaning is intended depends on context.
～てしまう can emphasize that an action has been carried out to completion, often with a sense of finality.
This usage often pairs with words like ぜんぶ全部、もう、or すっかり to reinforce the sense of thoroughness.
～てしまう is also used when something happens unintentionally, unfortunately, or against one's wishes. It conveys a feeling of regret, disappointment, or surprise.
The regretful nuance is often clear from context – if the outcome is negative or undesirable, ～てしまう signals that the speaker didn't want it to happen.
In casual speech, ～てしまう is frequently contracted to ～ちゃう, and ～でしまう becomes ～じゃう. These shortened forms are very common in everyday conversation.
The past tense forms are ～ちゃった and ～じゃった:
The polite contracted forms ～ちゃいます / ～じゃいます are also used in casual-polite speech.