"We know that to be true" is correct. There may be a way to argue that "We know that as being true" could be correct English, but it is a strain. For these purposes we can consider it incorrect.
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AnonymousHaving been to see John, he denies Jane's stealing as being the reason for their poor relationship.Having been to see John, he denies Jane's stealing to be the reason for their poor relationship.I don't like either of these. You can say " ... he denies that Jane's stealing is the reason for their poor relationship". However, another potential problem
AnonymousRight ok.Can you give me an example of a sentence which uses 'to be' and 'as being'?Thanks.Do you mean a sentence in which "to be" and "as being" can be interchanged?