The ELL question Do Americans pronounce 'are' as 'do' in 'what are waiting for?' brought to my attention something I've not noticed before.
In normal conversational (or faster) speech, it seems What are you waiting for? is pronounced something like Wadaya waiting for?, with (to me) the use of the Flap-T (alveolar flap) for the 'd' sound in 'Wadaya'. Seems to me, one is used, since it has the same context as what a, later, better, etc.
Which leads to: how is this different from the pronunciation of What do you as in Wadaya know/want/say' etc? Do we use an alveolar flap there also, or is there are different - d- sound? So, mainly, do the two questions What are you and What do you have the same or different pronunciation, when spoken in normal conversation, or faster?