In a sentence like "I don't know what he knows" or "I don't know if he knows" the sentence can express doubt or merely be a statement of fact. Wouldn't the choice of whether to use the indicative or subjunctive depend on what you are trying to convery (ie: "No sé lo que sepa" if I am trying to express doubt about what he knows but "No sé lo que sabe" if I am simply stating the fact that I don't know what he knows)?
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