The teenager eats the school paper. Who eats the school paper? Whose paper is it? What did the teenager do?
He eats the school paper. It is his paper. He ate his school paper.
The boy draws with color pencils. Who draws with color pencils. Whose color pencils are those? What did the boy do?
He draws with color pencils. Those are his color pencils. He drew with crayons.
The boy writes on the paper. Who writes on the paper? Whose paper is the boy writing on? What did the boy do?
He writes on the paper. It is his paper. He wrote on the paper.