One day Mr．and Mrs．Green go to the supermarket by car．They stop their car near a shop．They buy many things from the supermarket．They want to put the things in their car．But Mr．Green can’t open the door of the car．So they ask a policeman to help them．The policeman is very friendly to help them open the door of the car．At that time a woman comes up and shouts,”What are you doing with my car?” Mr．and Mrs．Green look at the number of the car and say”sorry” to the woman．