Wah How to use "Indirect Questions"

We use Indirect questions when we speak to someone we don’t know very well, or in formal situations. Indirect questions are often a little more formal and polite than direct ones. 

    Direct: Where is the post office?
    Indirect: Could you tell me where the post office is?

    Direct: Which hotel are you staying at?
    Indirect: Can I ask which hotel you are staying at?

    Direct: Who is that beautiful woman?
    Indirect: Could I ask who that beautiful woman is?

    Direct: What time does the store open?
    Indirect: Do you know what time the store opens?
    Note: We don’t use do,does or did in indirect questions  

    Direct: How much does this mobile phone cost?
    Indirect: Can I ask how much this mobile phone costs?

    Direct: Why did you resign from your job?
    Indirect: I was wondering why you resigned from your job. 
    Note: This statement is a request that ask someone to give more information, so this indirect one is not a question.

    Direct: Does Makoto speak English?
    Indirect: Could you tell me if Makoto speaks English?
    Note: We use if when you ask the indirect questions of a yes/no question.

    Direct: Are they going to see the football match tomorrow?
    Indirect: Do you know if they are going to see the football match tomorrow?

     Direct: Can we postpone the meeting?
     Indirect: Would it be possible for us to postpone the meeting?
     Note: We use Would it be possible in the indirect question when we ask about the possibility of something.

You can see other topics about asking question in these links:

Wah How to use "Tell + How / Where / When / What + To + Verb"

Wah How to use "How come..?"