Reasonandcause 　　Cause:①〔C〕“原因,起因,根源”somethingwhichproducesaneffort;aperson,athingoreventthatmakessthhappen 　　②〔u〕理由,缘故 　　Don’tcomplainwithout(good)cause.没有充分的理由就不要抱怨. 　　Acauseissththatproducesaresult;areasonissththatexplain,orexcuseanaction. 　　Cause使之产生某种结果的原因tocausesomeoneorsthtobeinaparticularcondition 　　Therewasnotenoughevidencetoprovethattobaccowasthecauseofdisease. 　　Ibelievethattheselargeincreaseshavebeenthecauseofmostofoureconomicproblems. 　　Itwasashocktoeveryonethattheirmarriagebrokenup,butsallyandherjealousywasthecauseofit. 　　Reason:①areasonwhysomeonedoessthorfeelsaparticularway使之解释或原谅某个行为的理由 　　Whydidyoudoit?Ihopeyouhadagoodreason. 　　Shewantstochangeherjobforpurelypersonalreasons. 　　Ithinkthereasonwhyshelefthimwasthathedranktoomuch. 　　TheonlyreasonIwentwasthatIwantedtomeetyouyourfriend. 　　②areasonthatexplainswhysthhappened 　　Thetaxonfuelhasincreasedandthisisthemainreasonforthepricerise. 　　Nowweknowtherealreasonwhyheislateforworkeverymorning. 　　Eachofushadreasonsforwantingtoleavebestknowntoourselves. 　　Ifyouhavegoodreasonsforsuspectingher,sheshouldbecloselyquestioned. 　　Thecauseoftheaccidentwasthefactthathewasdrivingtoofast.事故的原因是开车太快了. 　　Thereasonwhyhewasdrivingsofastwaslateforanimportantmeeting.他开车开的那么快的原因是他要参加一个重要的会议,时间已经晚了 　　Thecauseofthefireisnotknownyet. 　　ThereasonwhyIwasabsentyesterdayisthatIwassick.=Myillnesswasthecauseofmyabsence.我昨天缺席的原因是我生病了 　　Ifthedoctoraskswhy,thecomputergoesthroughitsmemoryandgivesthereason.如果大夫问为什么计算机就从它储存的现象中查找并说明理由.(不用cause) 　　Theydon’tknowthecauseofthedeathamongtheoldpeople. 　　他们不知道你老年人的死亡原因. 　　Wehavenoreasonnottostudyhard.我们没有理由不努力学习 　　Givethereasonforchoosingtheanswer.把你选这个答案的理由讲一下. 　　Heatisthecauseofexpansionofmatter.热是物体膨胀的原因 　　Smokingisthecauseofthecancer. 　　名词cause可接介词或of短语;causefor后接表示忧虑,埋怨,惊恐等表感情的词:e.g:causeforanger/regret/anxiety/complain(生气后悔忧虑埋怨的原因)causeofe.g:causeofthedelay/thenoise/thefighting/thedisaster(耽搁嘈音打架灾难的原因) 　　reasontodosth 　　Youdon’tneedtofindoutareasontophoneher. 　　Wehavenoreasontobelievehim. 　　Whatisthereasonforsuchbadbehavior?