" Compare: A: Do you know if Jack is married? B: No, I don't know.
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TitiwangsaDo you know if Jack is married?Why there is a "if" in the question?Indirect yes-no questions begin with "if".
TitiwangsaI just realised he was married, should IDid you know in the past? No. Therefore, you didn't know.useduse "don't" or "didn't"?