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(as) far as sb know
01
used to express one's uncertainty about the statement one has made as there might be something that makes it untrue
例
As far as he knew, the concert had already started when he arrived.
The company is expanding its operations, as far as we know.
Far as he knows, they are planning a surprise party for her.
Far as I know, she works as a teacher.
They are planning a surprise party for her, as far as he knows.
