Change into reporred speech. my friend asked me: " is it true that your grandfather fought in the world war ||? ". he asked me: "do know the word"brave"? . my american friend said: " london is the capital of great britain"

My friend asked me if it was true that my grandfather had fought in the world war ||.
He asked me if I knew the word"brave".
My American friend said that London is the capital of Great Britain.