Lesson26:KeeptheCandleBurning!useup的用法I.Learningaims:Masterthenewwordsandphrases:holder,shallow,lighter,match,examine,oxygenII.Learningimportantanddifficultpoints:NewWordsholdershallowlightermatchexamineoxygen◆Doyouthinkscienceisinteresting?Whyorwhynot?◆NameoneortwofamousChinesescientists.Whatdoyouknowaboutthem?ThinkAboutIt!LanguagePointsas作連詞，意為“當……時候”，引導時間狀語從句。如：1.Asthecandleburns,itusesupoxygenintheair.當蠟燭燃燒時，它要耗盡空氣中的氧氣。Ashegrewup,hebecamesilent.他長大以后，變得沉默寡言。useup意為“用完；用光”。useup是動詞加副詞型短語，賓語是代詞時必須放在use和up的中間；賓語是名詞時，放在use和up的中間或up的后面均可。如：Don'tuseupallthehotwater.不要用光所有的熱水。（1）分數的表達方式：分子為基數詞，分母為序數詞。并且當分子大于1時，分母要用復數。如：2.Becauseaboutonefifthoftheairismadeupofoxygen,thewaterrisesandfillsaboutonefifthofthejar.空氣中含有五分之一的氧氣，所以水位上升并且占了罐子的五分之一。five-eighths八分之五（2）帶有分數的名詞作主語時，謂語動詞的單復數，要根據分數所修飾的名詞來確定。如果分數所修飾的是可數名詞復數，謂語動詞用復數形式；如果分數所修飾的是不可數名詞，謂語動詞用單數形式。如：Aboutthree-fifthsofthestudentsinClassOneareboys.一班五分之三的學生是男生。Exercises1.Thewaterhereiss______,notdeep.2.Letthefireb______forafewhours.Theroomwillbeverywarm.3.Look!Theboyisplayingwithsome________(火柴).4.Thereislittle______(氧氣)atthetopofthemountains.5.Mr.Blacksatdownand________(點燃)acandle.I.根據首字母或漢語提示，完成下列句子。lit/lightedhallowurnmatchesoxygen1.Pleasepassmethebottlefull______water.2.Heissohungrythathehaseaten______allthefoodontheplate.3.Iusuallyputthecandle______thecandleholder.4.Mr.Gaocameintotheclassroom______abook