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Do you know where he is?
Do you know what this means?
Could you tell me the right way to do it?
Do you know when she's coming?
Could you tell me what's next?
Do you know who's in charge?
Could you tell me how to reach you?
Do you know how to get there?
Could you tell me when the deadline is?
Do you know why it's delayed?
Could you tell me why?
Do you know whose this is?