Indirect questions
They are more formal and more polite than direct questions.
They can be introduced with: Can you tell me…? Could you tell me…? Do you know…? Have you any idea…? Do you happen to know…? May I ask…? Would you mind telling me…?
The second part of the sentence will have S+V topic (word order) and will be introduced by if/ whether (yes/ no questions) or a question word (whquestions).
Eg. Direct question: Do you want to come? Indirect question: Could you tell me if you want to come? Direct question: Where is the bank? Indirect question: Could you tell me where the bank is?