Articles 1: a, an, the

I am sitting in office in university somewhere in UK, sitting at desk. On desk there is piece of paper, under piece of paper there is photograph of elephant. Next to desk there is window. Looking out of window I can see young man. He is wearing uniform and carrying umbrella. uniform is blue and umbrella is black. young man is crossing road. He is walking towards car. car is yellow. He is traffic warden and yellow car has been parked there for over hour.