dewgal Most successful people know that mistakes are good teachers. Correct. CJ
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dewgalMost successful people know that mistakes are good teachers.Correct.
dewgalWhy do we use that mistakes but not those mistakes?There is no combination "that mistakes" in the sentence. The two words don't go together as you may think they do.
dewgalSo should I put a comma between that and mistakes. ''Most successful people know that, mistakes are good teachers.No. No comma.