为...所 is a formal passive construction. It means "to be [verb]ed by" and is more literary than 被.
Formal/written passive - Used in news, literature, formal documents
Often with abstract subjects - Emotions, impressions, influence
Classical Chinese influence - Has an elegant, literary feel
His speech was praised by everyone.
This pattern sounds overly formal in casual conversation - use 被 instead for everyday speech.
为...所 is very formal
- ✅ Written: 为人所知
- Casual: 被人知道
Common fixed expressions
- 为人所知 (known by people)
- 为...所感动 (moved by)
- 为...所吸引 (attracted by)
所 cannot be omitted in this pattern
His speech was praised by everyone.
This secret is not known by people.
I was moved by her words.
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