How is my Japanese?
私の日本語はどうですか。
watashi no nihongo wa dou desu ka?
Am I speaking Japanese correctly?
私の日本語は正しいですか。
watashi no nihongo wa tadashii desu ka?
Note how the Japanese distinguish questions in writing with the particle 'か', not with the punctuation '?'.
"Sore WA anata no kuruma desuka" is how you say it if the car is near the person you are asking this from, if it's away from both of you, you must replace 'sore' with 'are' (read: a - re), since there are two different ways of saying 'that' in Japanese.
kuroi kuruma
or: kuroi jidousha
its kuro
kuruma (車)
kokuchou
kuroji
kuroari
Kokushibyou
kuroikokoro
Kurotsuki
Kuro Aisu=Black Ice
Kuroi sora is black sky.
kuroi no kumo
Kuroi kaeru