因为...所以 is the standard cause-effect pattern - "because...therefore."
Because it rained, I didn't go.
Either half can be dropped in casual speech. Reason always comes first.
Order: 因为 first, 所以 second
- ✅ 因为累，所以睡了
- ❌ 所以睡了，因为累
One half can be dropped
- 因为下雨，我没去
- 我没去，所以他很失望
Different from 由于 (formal)
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