Do you know what Mary wants?
Do you know who she is?
Do you know where he lives?
Do you know when Alice will leave?
Do you know why Jack can't come?
Do you know how I should do it?
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This pattern is similar to an Interrogative clause (adverb) follows the noun.
(1)Tell me what your name is=what to call you ?
----Do you know what your name is(=s + v ) ?
(2)Show me what you have in your underwear.
----Do you know what you have in your underwear ?
(3)Ask him where he put (the money).
----Do you know where he put (the money) ?
(4)Show them how to do magic.
----Do you know how to do magic ?
(5)Ask your man how to pronounce the word (e'er).
-----Do you know how to pronounce the word (e'er) ?
(6)Tell him where to put it.
-----Do you know where to put it ?
(7)Tell me why she can't come.
-----Do you know why she can't come ?
(8)Tell me why he hit me instead.
-----Do you know why he hit me instead ?