Sam is a teacher of maths (数学). He is forty-four years old. He has a round(圆的) face and black hair. He is short. He likes sports. He can play football and basketball. But he can't swim.
There are twenty boys and twenty-one girls in his class. They all like him.
Now it's in the afternoon. Look, some students are studying(学习) in the classroom. Sam is there, too. He is helping them to study maths. He is a nice teacher, and he is also a good friend of his students.
