初中英语中“倍数”的表达课件.ppt

英语中“倍数”的表达方式归纳,倍数英语中“倍数”的表达方式归纳,Thehouserentisexpensive.IvegotabouthalfthespaceIhadathomeandImpaying_here.A.asthreetimesmuchB.asmuchthreetimesC.muchasthreetimesD.threetimesasmuch正确答案为D,倍英语中“倍数”的表达方式归纳数,一、用times表示倍数（一般限于包括基数在内三倍或三倍以上的数。表示两倍的数，一般用twice）。其句式有：1.“times形容词/副词的比较级than”例如：LineABisthreetimeslongerthanlineCD.线段AB是（线段）CD的三倍长。Thishallisfivetimesbiggerthanourclassroom.这个大厅比我们的教室大5倍。,LineABislong.LineABislongerthanlineCD.LineABisthreetimeslongerthanlineCD.Thishallbig.Thishallbiggerthanourclassroom.Thishallisfivetimesbiggerthanourclassroom.,倍英语中“倍数”的表达方式归纳数,2.“times+as+形容词/副词的原级as”例如：Thistableisthreetimesaslongasthatone.这张桌子是那张桌子的三倍长。Thisdictionaryisfivetimesasthickastheoneyouborrowedfromthelibrary.这本词典的厚度是你从图书馆借的那本（厚度）的5倍。,Thistableislong.Thistableisaslongasthatone(is).Thistableisthreetimesaslongasthatone(is).Thisdictionarythick.Thisdictionaryisasthickasthatone(is).Thisdictionaryisfivetimesasthickasthatone(is).Thisdictionaryisfivetimesasthickastheoneyouborrowedfromthelibrary(is).,倍英语中“倍数”的表达方式归纳数,3.“times+the+名词（如：size，height，weight，length，width等）of”例如：Theearthis49timesthesizeofthemoon.地球的体积是月球的49倍。Thisriveristhreetimesthedepthofthatone.这条河是那条河的三倍深。,倍英语中“倍数”的表达方式归纳数,4.“times+more名词than”例如：Heearnsfivetimesmoremoneythanhedidtenyearsago.他现在挣的钱比十年前挣的多5倍。Therearetwicemorestudentsinourclassthanintheirs.我们班的学生人数比他们班多两倍。,倍英语中“倍数”的表达方式归纳数,5.“times+asmany（或much）名词as”例如：Weveproducedtwiceasmuchcottonthisyearas（wedid）tenyearsago.今年我们生产的棉花比十年前多了一倍。（汉语中的多一倍实际上也指两倍一样多。）Hehasgotthreetimesasmanybooksashissister.他拥有的书的数量是他妹妹的3倍。,WeveproducedmuchcottonthisyearWeveproducedasmuchcottonthisyearas（wedid）tenyearsago.Weveproducedtwiceasmuchcottonthisyearas（wedid）tenyearsago.Hehasgotmanybooks.Hehasgotasmanybooksashissister(has).Hehasgotthreetimesasmanybooksashissister(has).,倍英语中“倍数”的表达方式归纳数,6.“times+what从句”例如：Thelengthoftheroadisfourtimeswhatitwasthreeyearsago.这条路的长度是三年前的4倍。Thepriceofthemeatistwicewhatitwaslastyear.肉价是去年的两倍。,倍英语中“倍数”的表达方式归纳数,7.“times+upon（或over）”例如：Thesizeofthesunisamilliontimesoverthatoftheearth.太阳的体积比地球的体积大一百万倍。Heisthreetimesuponyourage.他的年龄是你的4倍（或：比你的年龄大3倍）。,倍英语中“倍数”的表达方式归纳数,8.“+by+times”例如：Comparedwithlastyear，ourcoaloutputhasincreasedbythreetimes.与去年相比，我们的煤产量增长了3倍。Hisspeedisfasterthanminebyfourtimes.他的速度比我的快4倍。,倍英语中“倍数”的表达方式归纳数,9.“times+comparedwith被比较对象”例如：Thenumberofthestudentsinourschoolhasincreasedfortimescomparedwith1980.我们学校的学生人数比1980年增加了3倍。,倍英语中“倍数”的表达方式归纳数,10.“times+thatof+被比较对象”例如：InthisworkshoptheoutputofJulywas3.5timesthatofJanuary.这个车间七月份的产量是元月份的3.5倍。,倍英语中“倍数”的表达方式归纳数,二、用分数、百分数表示倍数。例如：Theboxisone-thirdbiggerthanthatone.这个盒子比那个盒子大三分之一。Lastyeartheoutputvalueofindustrywas59percenthigherthanthatof1976.去年工业产值比1976年增长了59。MycommandofEnglishisnothalfsogoodasyours.我英语掌握得还不及你的一半儿好。,倍英语中“倍数”的表达方式归纳数,三、用again（一倍）double（两倍），triple（三倍）fourfold（四倍）等词表示倍数。例如：MyAuntisasoldagainasIam.我姑姑的年龄比我大一倍。Thetop-brandclothesareoftensoldasdoublethenormalpricehere.这里名牌衣服的售价经常比正常的售价高一倍。Thenewworkproceduretripledtheoutput.新工艺使产量增加两倍。Theoutputofgrainincreasedfourfold.粮食产量增加了三倍。,巩固练习,Americanseat_vegetablesperpersontodayastheydidin1910.A.morethantwiceB.astwiceasmanyC.twiceasmanyasD.morethantwiceasmanyKey：D,巩固练习,Paperproducedeveryyearis_theworldsproductionofvehicles.A.thethreeweightofB.threetimestheweightofC.asthreetimesheavyasD.threetimesasheavierasKey：B,巩固练习,WiththehelpoftheGermanexperts，thefactoryproduced_carsin1993astheyearbefore.A.astwicemanyB.asmanytwiceC.twiceasmanyD.twicemanyasKey：C,巩固练习,Thisshipmeasures_thatone.A.astwiceaslongB.astwicel