This is the 11166th most frequent Turkish word.
döndüğünde
"When you return" or "when you turn."
In this sentence, 'döndüğünde' is used to indicate the time of returning to a place, specifically the classroom.
Sınıfa döndüğünde her şey değişmişti.
When he returned to the classroom, everything had changed.
Here, 'döndüğünde' refers to the moment when the subject 'you' returns, indicating a future point.
Sen döndüğünde yeni bir plan yapabiliriz.
When you return, we can make a new plan.
In this context, 'döndüğünde' refers to completing a journey and returning, signaling a past event.