grammar - Changing subject and verb positions in statements and questions

We always change subject and verb positions in whenever we want to ask a question such as "What is your name?". But when it comes to statements like the following, which form is correct?

1. I don't understand what are you talking about.


2. I don't understand what you are talking about.

Another example

1. Do you know what time is it?


2. Do you know what time it is?

Another example

1. Do you care how do I feel about this?


2. Do you care how I feel about this?

Answer

In all the cases you reported, the second sentence is the correct one. It is similar to the word order in They asked who I was.