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〜ta totan ni

〜た　とたん　に〜ta totan ni
the moment an action finishes, with a sudden result
From Lesson 74:Relaxing in a hot-spring town·Hardcore Japanese

Usages of 〜ta totan ni

足湯あしゆ　に　入はいった　とたん　に、　送迎そうげいバス　が　来きた。asiyu ni haitta totan ni, sougeibasu ga kita.
The moment I entered the footbath, the shuttle arrived.
露天風呂ろてんぶろ　に　入はいった　とたん　に、　雪ゆき　が　降ふった。rotenburo ni haitta totan ni, yuki ga hutta.
The moment I entered the open-air bath, it snowed.
脱衣所だついじょ　を　出でた　とたん　に、　友達ともだち　が　温泉おんせんまんじゅう　を　持もって　来きた。datuizyo wo deta totan ni, tomodati ga onsenmanzyuu wo motte kita.
The moment I left the undressing room, my friend brought a steamed bun.
貸切風呂かしきりぶろ　の　ドア　を　開あけた　とたん　に、　湯気ゆげ　が　出でた。kasikiriburo no doa wo aketa totan ni, yuge ga deta.
The moment I opened the door to the private bath, steam came out.
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“How do verb conjugations work in Japanese?”
Japanese verbs conjugate based on tense, politeness, and mood. For example, the polite present form adds ‑ます to the verb stem, while the past tense uses ‑ました. Unlike English, Japanese verbs don't change based on the subject — the same form works for "I", "you", and "they".

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