Examples of using "何が起こったんだ?" in a sentence and their english translations:
- What's up?
- What happened?
I wonder what happened.
What happened, Sally?
What happened to Tatoeba?
- What's up?
- S'up?
- How's your walk?
I wonder what happened to her.
- What happened?
- What's happened?
- What has happened?
- What happened?
- What's the matter?
- What's happened?
- What has happened?
- What is it?
- What happened?
- What's happened?