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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
例子
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.
