人教版英语八年级下册unit7-section-A-1a-1c-课件(共19张PPT)

Unit7What'sthehighestmountainintheworld?SectionA1a-1cWhatisthehighestmountianintheworld?Whatisthelongestriverintheworld?Whatisthelargestdesertintheworld?Whatisthedeepestsaltlakeintheworld?两位数(几十几)：“十位数”(几十）-“个位数”(几)三位数(几百几十几)：数字+()+and+两位数小数：数字中的小数点读作(),小数点后数字之间读不加单位（百，千...）.如：3.14threeonefour44forty-four844eighthundredandforty-four100onehundred4.43fourpiontfourthree百位以上的数字：由高位读向低位，但读之前注意分析（1）从右往左数三个数字为一组，每组用逗号(comma[ˈkɑ:mə])隔开，每组中的数字按照三位数和两位数的读法.如:1,415,926（2）从右往左数，第一个逗号读作thousand,第二个逗号读作().如：2,220,000twotwoandtwentyCanyoureadthefollowingnumbers?3,000,0006,6719,600,000threemillionsixthousandsixhundredandseventy-oneninemillionsixhundredthousand1000onethousand10,000tenthousandCanyouwriteoutthecomparativesandsuperlativeforms(比较级和最高级)offollowingadjctives?bighighdeeplong形容词或副词的比较级和最高级构成规律：1.规则变化：(1)一般在词尾加或;(2)以字母e结尾的词，在词尾加或(3)重读闭音节词词尾只有一个辅音字母时，先该辅音字母再加-er或-est(4)以'字母”结尾的双音节词，先把y改为i再加-er或-est(5)在词前加或2.不规则变化：如：good/well.ereststr双写ymostmorebetterbest1.形容词或副词比较级前可以用，still,even,alot,,abit来修饰。如:muchbetter,alittletaller2.含原级比较的句子(陈述句)结构是;A+be/行为v.+as++as+B.如:LilyisastallasLucy.3.含比较级的句子(陈述句)结构为:A+be/行为v.++than+B.如:LilyistallerthanLucy.4.含最高级的句子(陈述句)结构为:A+be/行为v.+(the)++短语.如:Lilyisthetallestinherclass.5.用比较级表示最高级句子(陈述句)结构为:A+be/行为v.+adj./adv.比较级+than++n.+of/in短语.如:Lilyistallerthananyothergirlinherclass.muchalittleadj./adv.原级adj./adv.比较级of/inadj./adv.最高级anyotherQomolangma[ˈtʃəuməuˌla:ŋmə]珠穆朗玛峰theNile[nail]尼罗河theCaspian[ˈkæspiən]Sea里海theSahara[sə'ha:rə]撒哈拉沙漠square[skweə(r)]n.平方米；正方形meter[ˈmi:tə(r)]n.米；公尺deep[di:p]adj.深的desert[ˈdezət]n.沙漠Doyouknowwhichmountainitis?It'sQomolangma[ˈtʃəuməuˌla:ŋmə].1aQomolangmaabout9,600,000squarekilometersinsizeTheSahara1,025metersdeepTheCaspianSea6,671kilometerslongTheNile8,844.43metershighCanyouread?10米长20米深1千米高面积100平方千米tenmeterslongonekilometershightwentymetersdeeponehundredsquarekilometersinsize用英文表达物体的长度，宽度，高度，深度，面积等：数字+单位（米,千米，平方千米）单数或复数+形容词（长，宽wide，高，深）或介词短语（inlength/width/height/depth/size)meterkilometersquarekilometerlonghighdeepThebagislong,wideandhigh.Thebagisinlength,inwidthandinheight.cm=centimeter用英文询问物体的长度，宽度，高度，深度，面积等：...多长/多宽/多高/多深/多大？How/wide///large+be+n.？longdeephigh珠穆朗玛峰有多高？尼罗河有多长？里海有多深？HowhighisQomolangma?HowlongistheNile?HowdeepistheCaspianSea?Qomolangmaabout9,600,000squarekilometersinsizeTheSahara1,025metersdeepTheCaspianSea6,671kilometerslongTheNile8,844.43metershighMatchthefactsyouknow.1bListenandcompletethesentences.1.Qomolangmais_________thananyothermountainintheworld.2.TheSaharais__________desertintheworld.3.TheCaspianSeais___________ofallthesaltlakes.4.TheNileis_________riverintheworld.higherthebiggestthedeepestthelongestUsetheinformationin1btomakeconversations.1cA:Whatisthehighestmountainintheworld?B:Qomolangma....thehighestmountainthedeepestsaltlakethelongestriverthebiggestdesertQomolangmaTheCaspianSeaTheNileTheSahara1.Memorizetheimportantphrasesandsentences.2.Makesomedialoguesaboutaskingthesizeofobjects.