Could you tell me what time the shop next door 3 opens? Do you know if (whether) Mark's coming to the meeting?
We use indirect questions when we want to ask a question in a more polite way, and begin with Can / Could you tell me ... ? or when we introduce a question with, e.g. Do you know ... ? Do you remember ... ?
Direct question: What time does the shop next door open?
Indirect question: Could you tell me what time the shop next door opens?
In indirect questions the order is subject + verb.
Right: Can you tell me where it is?
Wrong: Can you tell me where is it?
We don't use do /did in the second part of the question.
Right: Do you know where he lives?
Wrong: Do you know where does he live?
You can use if or whether in questions without a question word (What, How many, etc.) and after Can you tell me, Do you know, etc.
Direct question: Is he coming to the party tonight?
Indirect question: Do you know if he is coming to the party tonight?
Source: English File, Upper-Intermediate
by Chritina Latham-Koenig and Clive Oxenden
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