〜たとたん（に）

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途端とたん(に) follows past tense casual verbs, and is used to express: "the moment (someone did) X, Y happened".

E.g. 立たち上あがった途端とたんに、めまいがした。 "The moment I stood up, I got dizzy."

E.g. 犬いぬは飼かい主ぬしの顔かおを見みた途端とたん、しっぽを振ふって喜よろこんだ。 "The moment the dog saw its owner's face, it wagged its tail happily."

途端とたん can be written in either kanji or kana.

～途端とたん(に) should be followed by instantaneous actions/actions that happen in quick succession.

～途端とたん(に) should not be followed by the speaker's will/intent, plans, or by a request/command.

Summary

• 

  途端とたん(に) is used to express: "the moment (someone did) X, Y happened"

• 

  途端とたん(に) follows past tense casual verbs

• 

  途端とたん can be written in either kanji or kana

• 

  ～途端とたん(に) should be followed by instantaneous actions/actions that happen in quick succession