Can I say,<br/><br/><br/><br/>(a) The car whose / which who is parked under the tree is mine.<br/><br/><br/><br/>(b) Hey, you’ve forgotten to take your car keys.<br/><br/> Hey! You’ve forgotten to take your car keys.<br/><br/> Hey, you’ve forgotten to take your car keys! <br/><br/><br/><br/>(c) The front part of the car was badly damaged / spoiled / broken.<br/><br/>(d) Witnesses said a / the / that motorcyclist was speeding.<br/><br/>(e) Both the passengers / people / drivers/ owners of the car