Oneday,Tim'smathematicsteacherlookedathishomeworkandsawthathehadgotallhissumsright.Theteacherwasverypleased-andrathersurprised.HecalledTimtohisdeskandsaidtohim,"Yougotallyourhomeworkrightthistime,Tim.Whathappened?Didyourfatherhelpyou?"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.Hewastoobusylastnight,soIhadtodoitallmyself,"saidTim.“不,先生,我爸爸昨天很忙,我不得不全由自己做了。”