Toen ik klein was, woonde ik in Amsterdam.
English: When I was little, I lived in Amsterdam.
'Toen' is a word used in Dutch to introduce a subordinate clause (bijzin) that talks about something that happened once in the past.
Use 'toen' when you want to talk about a specific moment or event that happened once in the past. It connects two actions, where one happened after or during the other.
Toen ik klein was, woonde ik in Amsterdam.
English: When I was little, I lived in Amsterdam.
Ik was blij toen ik het goede nieuws hoorde.
English: I was happy when I heard the good news.
Toen hij thuiskwam, begon het te regenen.
English: When he came home, it started to rain.
We gingen naar buiten toen de bel ging.
English: We went outside when the bell rang.