结构助词「所」suǒ

Structural Particle: 所 (suǒ) in Formal Writing

Meaning: That which / What is [V]-ed (nominalizer / formal modifier marker)

Pattern

"所" (suǒ) is a classical structural particle widely used in modern formal Chinese before a transitive verb:
(1) Formal relative clause: "(Subject) + 所 + V + 的 + Noun" turns the verb's action/object into a dignified modifier (e.g., 他所提出的建议 — the proposal that he put forward).
(2) Nominalized phrase (omitting the head noun): "(Subject) + 所 + V + 的 (+ 一切/全部)" means "all that [Subject] V-s" (e.g., 这是我所知道的全部 — This is all that I know).

1
这是我所知道的全部。
Zhè shì wǒ suǒ zhīdào de quánbù.
This is everything that I know.
2
他所提出的建议非常有价值。
Tā suǒ tíchū de jiànyì fēicháng yǒu jiàzhí.
The proposal that he put forward is very valuable.
3
众所周知，吸烟有害健康。
Zhòng suǒ zhōu zhī, xīyān yǒu hài jiànkāng.
As everyone knows, smoking is harmful to health.

•所 always precedes a transitive verb (Subject + 所 + V + 的 + N); also used in the formal passive 为/被…所 + V.

⚠️ Common Mistakes:

•Placing 所 after a noun instead of before a verb: 所 must precede the verb.

•Using 所 before an intransitive verb that cannot take a logical object (e.g., *我所休息的地方).

•Omitting 的 after "所 + V" when modifying a following head noun in modern prose (e.g., *他所提出建议 -> 他所提出的建议).

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