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.

一天，蒂姆的數(shù)學(xué)老師看了他的作業(yè)，發(fā)現(xiàn)他全做對(duì)了。老師很高興，同時(shí)也十分驚訝。他把蒂姆叫到桌前說(shuō)：“蒂姆，你這次的作業(yè)全都做對(duì)了，怎么回事？你爸爸幫你做了嗎？”

“不，先生，我爸爸昨天很忙，我不得不全由自己做了。”