YOU SAID:

My pen is floating above my car

INTO JAPANESE

私のペンは私の車に浮いています。

BACK INTO ENGLISH

My pen is in the air on my car.

INTO JAPANESE

私のペンは私の車の空気中です。

BACK INTO ENGLISH

My pen is in the air in my car.

INTO JAPANESE

私のペンは私の車では空気中です。

BACK INTO ENGLISH

My pen is in the air in my car.