Grammar Info

N3 Lesson 8: 7/23


The instant or moment, As soon as, Just as

Cannot be used after Nouns or Adjectives


Verb[た]+ とたん()


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About たとたんに

たとたんに, frequently seen using its kanji form 途端(とたん) is a structure used to convey that something happens 'the instant', or 'the moment' that something else occurs. It is a combination of the auxiliary verb た (indicating the completion of a verb), and the noun 途端(とたん) 'on the tip of' used adverbially (with ).
(A) 途端(とたん) (B) is used to express (B) things that are beyond the control of the speaker, and may be considered strange, or unexpected.
  • 高速(こうそく)()途端(とたん)、タイヤパンクした。
    The moment I got on the highway, my tire got punctured.
  • 布団(ふとん)(はい)途端(とたん)先輩(せんぱい)から電話(でんわ)かかってきた
    The moment I got into my futon, I received a call from my senpai.
As 途端(とたん) literally means 'on the tip of', any (B) action is considered to happen either directly upon (A), or even simultaneously with (A).



  • ()たとたんに(あめ)()(はじ)めた。

    The instant I went outside, it began to rain.

    • (まど)()たとたん(とり)部屋(へや)(なか)(はい)ってきた。

      As soon as I opened the window, a bird flew into the room.

      • (かえ)ろうとしたとたん仕事(しごと)(たの)まれた。

        Just as I was about to leave, I was given more work to do.

        • 彼女(かのじょ)随分(ずいぶん)大人(おとな)になっていたが、()たとたんあの()だと()かった。

          She had grown up a lot, but I knew that child was her the moment I saw her.

          • (あお)になったとたんに()()のは(あぶ)ない

            It's dangerous to speed off the instant (the traffic light) turns green.

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            たとたんに – Grammar Discussion

            Most Recent Replies (5 in total)

            • mrnoone


              Hey and sorry for the late answer

              Hey and welcome on the community forums!

              To be honest, this is a matter of convention. Some Japanese feel that adding に if there is a comma already is not necessary. Not an error though.

              I think that we will change those hints, and simply accept answers with に.

            • eccol


              Thanks for the reply!
              The sentence I was being marked wrong on was 座ったとたん用事を思い出した。which I now notice doesn’t even have a comma. Is that correct?

            • mrnoone


              Yes, 座ったとたんに用事を思い出した。is correct , and should be accepted, since it is added to the answer list

              It might have been some kind of one-time bug, I will tell the technical part of the team to check it

              Sorry fot the inconvenience!

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