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I'd like to ask a question like this, but I am not sure whether I should add s at the end of the verb

Could you tell me how long it usually takes to ... ?

or

Could you tell me how long does it usually take to ... ?

  • What research have you done? – AmE speaker Nov 29 '17 at 0:30
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    @Clare - I don't mind if you gently nudge people toward showing more research, provided it's done in an amiable and cordial way. However, I don't see much point in leaving comments like "What research have you done?" under questions that were asked months and months ago. – J.R. Nov 29 '17 at 16:08
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  1. Direct questions include the auxiliary.

    How long does it usually take to ... ?

  2. Indirect questions don't include the auxiliary.

    Could you tell me how long it usually takes to ... ?

  • what if, say, "who did it?" :p – Herman Nz Mar 2 '16 at 17:31
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    @HermanNz But did is not working as an auxiliary in that case. :) – Alejandro Mar 2 '16 at 18:05

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