What is the difference, for example, between "As far as I know" and "As much as I know"?
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As far as I know = A person usually says this when they believe something may be true. They perhaps just heard about something, but there is a possibility of actually not knowing the true answer.
As much as I know = A person usually says this when they have told you all pieces of information / everything that they have gained from their studies, communication, or interactions.
Both are very similar. But they can be quite different