が versus は in 'これ は/ が あなた の くるま です か。
I'm learning through a book at the moment, and in one place it says 'これ は あなた の くるま です か。’ and in another, it says ’あれ が あなた の くるま です か。’ Why is one が and the other は?
I know that これ is 'this' and あれ is 'that one over there'. Does that make a difference, or is it something else?