Me: Excuse me. Could you tell me where the nearest station is?
Person in the street: Certainly. It's along that road on the right.
Me: Thank you. And do you know if there's a supermarket near
Person in the street: Yes, there's one next to the station.
Me: Thank you very much for your help.
We can use indirect questions when we’re asking for help in the street, because they are very polite. Indirect questions start with a phrase like 'could you tell me...' or 'do you know...'. In this case the sentence should be AFFIRMATIVE
Direct question: Where is the bank?
Indirect question: Do you know where the bank is?
Direct question: Have you seen my dog? Indirect question: Could you tell me if you have seen my dog?
When we report what people say, we usually change the tense of the verbs to reflect that we are reporting – not giving direct speech. This pattern is followed when we report questions and there are also other important changes between direct questions and reported questions.
NOTE that the tense of the verb changes as it does in reported speech. The word order is the same as in an affirmative sentence.
2. Questions with a question word: When there is a question word (what, where, why, who, when, how) we use that question word in the reported question, but there is no auxiliary verb and the word order is like in an affirmative sentence.
Direct question:What time does the train leave?” Reported question: He asked what time the train left.
After you have studied the theory above, get into the following link for some practice