Lesson26:KeeptheCandleBurning!useup的用法I.Learningaims:Masterthenewwordsandphrases:holder,shallow,lighter,match,examine,oxygenII.Learningimportantanddifficultpoints:NewWordsholdershallowlightermatchexamineoxygen◆Doyouthinkscienceisinteresting?Whyorwhynot?◆NameoneortwofamousChinesescientists.Whatdoyouknowaboutthem?ThinkAboutIt!LanguageLanguagePointsPointsas作连词，意为“当……时候”，引导时间状语从句。如：1.Asthecandleburns,itusesupoxygenintheair.当蜡烛燃烧时，它要耗尽空气中的氧气。Ashegrewup,hebecamesilent.他长大以后，变得沉默寡言。useup意为“用完；用光”。useup是动词加副词型短语，宾语是代词时必须放在use和up的中间；宾语是名词时，放在use和up的中间或up的后面均可。如：Don'tuseupallthehotwater.不要用光所有的热水。（1）分数的表达方式：分子为基数词，分母为序数词。并且当分子大于1时，分母要用复数。如：2.Becauseaboutonefifthoftheairismadeupofoxygen,thewaterrisesandfillsaboutonefifthofthejar.空气中含有五分之一的氧气，所以水位上升并且占了罐子的五分之一。five-eighths八分之五（2）带有分数的名词作主语时，谓语动词的单复数，要根据分数所修饰的名词来确定。如果分数所修饰的是可数名词复数，谓语动词用复数形式；如果分数所修饰的是不可数名词，谓语动词用单数形式。如：Aboutthree-fifthsofthestudentsinClassOneareboys.一班五分之三的学生是男生。ExercisesExercises1.Thewaterhereiss______,notdeep.2.Letthefireb______forafewhours.Theroomwillbeverywarm.3.Look!Theboyisplayingwithsome________(火柴).4.Thereislittle______(氧气)atthetopofthemountains.5.Mr.Blacksatdownand________(点燃)acandle.I.根据首字母或汉语提示，完成下列句子。lit/lightedhallowurnmatchesoxygen1.Pleasepassmethebottlefull______water.2.Heissohungrythathehaseaten______allthefoodontheplate.3.Iusuallyputthecandle______thecandleholder.4.Mr.Gaocameintotheclassroom______abookinhishand.5.Therainydaywilllast______threedays.II.用适当的介词填空。forofupinwith1.当蜡烛停止燃烧时，它已用光了空气中所有的氧气。Whenthecandle_______________,it________________alltheoxygenintheair.2.我们班里五分之三是女生。__________ofthestudentsinourclassaregirls.4.为了完成那项工作，他工作了十个小时。_________thework,hehasworked____tenhours.III.根据汉语提示，翻译下列句子，每空一词。stopsburninghasusedupThree-fifthsTofinishforHomeworkHomeworkChooseaexperimentthatyoudidbefore,anddescribeitinEnglish.
