JLPT N3
～たとたん
Just as ～; when ～; as soon as ～
Structure / Usage
V-たとたん（に）
Example Sentences
犯罪者が警察を見たとたん、逃げました。
As soon as the criminal saw the police, he ran.
窓を開けたとたん、風が入ってしまった。
The wind came in just as I opened the window.
Just as ～; when ～; as soon as ～