八英语课件.ppt

Lesson30KeeptheCandleBurning Learningaims 知识目标Masterthenewwords match light burn useup shallow candleholder oxygen one fifth2 Theimportantsentences Fillthedishhalffullofwater Asthecandleburns itusesupoxygenintheair Thereisaboutone fifthoxygenintheair sothewaterrisesandfillsaboutone fifthofthejar 教学重点 1 DescribeandexplaintheexperimentinEnglish 2 分数的表达法 教学难点 DescribeandexplaintheexperimentinEnglish 能力目标 candescribeandexplaintheexperimentinEnglish 情感目标 Cultivatethespiritoflovingscience 预习早知道1 match pl light 过去式 过去分词 burn 过去式 过去分词 v 燃烧useupone fifthshallow 反义词 half pl matches n 火柴 比赛 lighted lit lighted lit v 点燃 使燃烧 照亮 使光明 burned t 用完 用光 五分之一 burned t deep halves LookandLearn 1 Whatarethey Theyare Theyareusedto something Iwillusethem acandle Iam thecandlewiththematch Myfatheroftenusesmatches hissmoke 2 Thisafternoonwe llhaveabasketball matches light tolight lighting tolight match LookandLearn Becauseburningneeds whenthecandlestopsbuirning ithas alltheoxygeninthejar Theyhave allthewater What sthis It sa It sa candle IfIputthejarovertheburningcandle whatwillhappen Itwillgoout stop why candle burning burning oxygen used up useup usedup 一 自主探究 合作学习 1 He thespoon thebowl 他把汤匙放到了碗里面 2 Lily thebottle water Lily把瓶子装满了水 3 Theroom smoking 屋子里充满了烟 4 Pleaseputthejar thecandle 请把罐子放到蜡烛的上面 5 Mymother hermoneytobuyclothingyesterday 我妈妈昨天买衣服花光 用光 了她身上所有的钱 6 Inourclass studentsareboys studentsaregirls 在我们班 三分之二的学生是男生 三分之一的学生是女生 二 小组合作操练 用上述新知识点造句 并在小组内核对 交流 put in filled with isfullof isfilledwith over usedup two thirds one third 点拨ComepareandFind One fifthfour fifthsone thirdtwo thirds 分数表达法分子基分母序分子大于1分母加S 1 54 51 32 3 基数词 序数词 分子 分母 5 9 Practise 1 4 one fourth 3 7 three sevenths Thereisaboutone fifthoxygenintheair sothewaterrisesandfillsaboutone fifthofthejar aquarter five ninths 强化训练 单项选择1 Thebottleisonly full A halfB ahalfC halfsD halves2 She thechickenbonestomakesoup A UsedforB usedtoC usedupD usedwith3 ofthestudentsinourschool fromcountryside 乡村 A Four fifths comesB Fourth five comeC Four fifth comeD Four fifths come4 ofwater A Three fourths areB Three four isC Three quarters isD Three fourth is4 Theriveris here wecanwalkacross A deepB fastC shallow5 Yellowisa colour butblackisdark A orangeB lightC heavy A C D C C B Watch Say answerandFill First thecandle thecandleholder Then thecandleholder thedish Third thedish water Fourth thecandle Fifth thecandle fortwominutes Sixth carefully thejar thecandleuntilthetopofthejar onthedish Whatobservationcanyoumake Howdowedotheexperiment put put in in Fill halffullof Light let burn put over rests Think ReadandAnwser 1 Whydidthecandlestopburning becausetherewas oxygeninthejar 2 Whydidthewaterrise Theforceoutsidethejaris thantheforceinsidethejar 3 Howfardidthewaterrise Why Itroseabout ofthejar Becausethereisone fifthoxygeninthe no stronger one fifth air summary Thenewwords match light burn shallow candleholder oxygen Thephrasesandexpressions useup one fifth keepsb sthdoing keepsth sb adjStopdoing todosth put in over分数的表达 分子基 分母序 分子大于1 分母加Ssentences Fillthedishhalffullofwater Asthecandleburns itusesupoxygenintheair Thereisaboutone fifthoxygenintheair sothewaterrisesandfillsaboutone fifthofthejar Howdo keepthecandleburning 用所给单词的正确形式填空 1 Youareverytired You dbetterstop have arest 2 Whatdoyouusetomakeacandle burn 3 Youshouldputthejaroverthecandle careful 4 What observe canyoumake 5 Pleasecuttheappleinto half 6 He light acandleandtheroomwasbright 7 Hekeptthecandle burn fortwohours 8 It stime play basketball 9 Eatinggreenfoodcanhelptokeepyou health 10 I msorry Ikeptyou wait foralongtime tohave burn carefully observation s halves lighted lit burning toplay healthy waiting 1 Readthetextaloudandrecitetheexpermentofthislesson 2 Write Howdo thatyou