Hello, guys, I really need your help. We have been getting through Polite questions at school but I do not quite undestand this example:<br/><br/>Who did that?<br/>Do you know<u>.................?</u><br/><br/>I have to make this question polite with "Do you know" but I do not know how to do it.<br/><br/>Help!<br/><br/>Thank you!