てしまう

JLPT N3 Japanese self-study　·　~10 min　·　Done and over / Oops: completion and regret

'I accidentally ate the whole cake', 'I forgot my homework' — てしまう expresses completion, often with a tinge of regret.

What you'll learn

• てしまう = completed (often with regret)
• Casual shorthand: ちゃった
• Express regret or accidental actions

How to study “てしまう”

“てしまう” (Done and over / Oops: completion and regret) is a JLPT N3 chapter of our free Japanese self-study course, about 10 min. You learn by doing — flashcard drills and fill-in-the-blank quizzes graded on the spot — completely free, with no sign-up and no ad wall. Once it clicks, read the matching in-depth explainer over in Grammar.