One day, Tim's mathematics¹ 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?” 一天，蒂姆的数学老师看了他的作业，发现他全做对了。老师很高兴，同时也十分惊讶。他把蒂姆叫到桌前说：“蒂姆，你这次的作业全都做对了，怎么回事？你爸爸帮你做了吗？”

“No, sir. He was too busy last night, so I had to do it all myself,” said Tim.

“不，先生，我爸爸昨天很忙，我不得不全由自己做了。”