～たとたん(に)
ta totan ni
The moment; just as; immediately after
Formation 接続
Full formation notes
Past ta-form verb + とたん(に), followed by an event occurring immediately, usually unexpectedly.
Explanation 説明
An event occurs the instant the preceding action finishes, often unexpectedly. The second clause normally does not state the speaker's intention, command, or invitation. It is more immediate than simply after a while.
Examples 例文
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窓を開けたとたん、強い風が入ってきました。
The moment I opened the window, a strong gust came in.
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席に座ったとたん、名前を呼ばれました。
Just as I sat down, my name was called.
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家を出たとたんに、雨が降り始めました。
The moment I left home, it started to rain.
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電気を消したとたん、猫が走り出しました。
As soon as I turned off the light, the cat started running.
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優勝が決まったとたんに、涙が出ました。
The moment my victory was confirmed, I burst into tears.
How related patterns differ 比較
いつのまにか highlights a change whose timing went unnoticed. つつある describes an ongoing change, and うちに describes a change during a period. つい concerns an unintentional action, while たとたんに emphasizes a particular instant.
| Pattern | Meaning | Example |
|---|---|---|
| ～たとたん(に) | The moment; just as; immediately after | 窓を開けたとたん、強い風が入ってきました。 The moment I opened the window, a strong gust came in. |
| 〜てはじめて | Only after doing something did one realize | 社会人になってはじめて学生の気楽さに気付いた。 Only after starting work did I realize how carefree student life was. |
| ～たものだ | Used to; would often do in the past | 子どものころ、よくこの川で泳いだものだ。 When I was a child, I used to swim in this river. |
| ～たて | Freshly done; newly completed | できたてのたこ焼きは、とっても熱いので、火傷をしないようにしてくださいね。 Freshly made takoyaki is very hot, so please be careful not to burn yourself. |
| ～つい | Unintentionally; before one can stop oneself | 彼と話すのは楽しいので、つい長電話をしてしまう。今日も気づいたら2時間も話していた。 I enjoy talking to him, so I end up staying on the phone too long. Today, two hours had passed before I noticed. |
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