英语笑话:Did your dad help you? 你爸爸帮你了吗？

One day, Tim's mathematics teacher looked at his homework and saw that he had got all his sums right. The teacher was very pleased-and rather surprised. He called Tim to his desk and said to him, "You got all your homework right this time, Tim. What happened? Did your father help you?""No, sir. He was too busy last night, so I had to do it all myself," said Tim.