Questions & Answers about Akşam oldu mu, ben evde kalıyorum.
Literally, it means something like When it became evening or Once evening came.
- akşam = evening
- oldu = became / it became
- mu = a particle that can have different functions depending on context
So the idea is not really the evening did something, but rather it becomes evening / evening arrives.
Because in this pattern, -DI mi? can mean when/once/as soon as rather than an actual question.
So:
- Akşam oldu mu... = When evening comes... / Once it’s evening...
This is a very common Turkish structure. It may look like a question to an English speaker because mu is the normal question particle, but in sentences like this, the meaning is more like a time clause.
Context and intonation help distinguish the meanings.