英语人教版八年级下册unit7 SectionB1A-1D.ppt

Unit7Whatsthehighestmountainintheworld?,SectionAGrammarSectionB1a-1d,TeachingAims,1.Tolearncomparativesandsuperlatives2.Trytowriteashortpassageaboutpandas,GrammarFocus,GrammarFocus,形容词、副词的比较级和最高级comparativesandsuperlativeswithadj.andadv.,大多数形容词和副词有三个等级：原级、比较级、最高级。一、形容词、副词比较级的构成1.构成的不规则变化:2.构成的规则变化:,形容词和副词的比较级,1.构成的不规则变化:e.g.good/wellbetterbad/badlyworsemany/muchmorelittlelessfarfarther/further,2.构成的规则变化:1)单音节词和少数双音节词一般在词尾后加-er构成比较级.如：原级比较级coldcolderbrightbrighteryoungyounger,2)以字母e结尾的词只加r构成比较级。原级比较级nicenicerfinefinerlargelarger,3)重读闭音节词末尾只有一个辅音字母时,先双写这个辅音字母,再加-er。如:bigbiggerthinthinner4)以“辅音字母+y”结尾的双音节词，先改y为i,再加-er。如：easyeasierhappyhappier,5)多音节词和部分双音节词在词前加more。如：deliciousmoredeliciousinterestingmoreinterestingimportantmoreimportant,形容词最高级的构成,B:heavyeasytidydrybusyhappyhealthyhungryearly,y-i-est,C:largelatenice,-st,biggest,D:big,hot,hottest,thin“双写”,thinnest,wet,wettest,fat,fattest,Adjective,deliciousdangerousinterestingpopularbeautifulcarefulfriendly,themost-adj.,Adjective,best,far,little,worst,most,farthest,least,good,well,bad,badly,many,much,最高级规则变化口诀：,最高级，很容易，一般词尾加est。(cheap-thecheapest)词尾若有哑音e,直接就加st。(close-theclosest)重读闭音节,单辅音字母要双写。(big-thebiggest)辅音字母加y,记得把y变为i。(friendly-thefriendliest)多音节，考考你，themost到底加哪里？(popular-themostpopular),用法：英语中三者或三者以上相比较，表示“最”这样的最高程度概念时，要用“the+最高级”的结构表示。这种句式一般带有表示比较的介词短语，比如:inourclass,ofthethree等。例如：WangLinisthetallestinourclass.Thistheateristhecheapestofthethree.注意使用最高级时应注意以下几点：,形容词的最高级,(1)表示“最之一”的句式，要用oneofthe+形容词最高级+复数名词。例如:JingjiangHotelisoneofthebiggesthotelsinourcity.(2)当最高级前面有物主代词或名词所有格时，不加定冠词the。例如：TomisLucysbestfriend.Tuesdayisherbusiestday.(3)最高级前可加序数词。例如：TheYellowRiveristhesecondlongestriverinChina.,3.LinTaois_intheclassbecausehenevergetstoschoolontime.（最懒的学生之一）,oneofthelazieststudents,TheYangtzeRiveris_riverintheworld.(第三长河）,thethirdlongest,2.TheAtlanticis_oceanintheworld.(第二大洋）,thesecondbiggest,Exercise:,一、翻译句子：,1.TheSaharaisthe_(big)desertintheworld.2.TheNileis_(long)thanTheYangtzeRiver.3.TheCaspianisthe_(deep)ofalllakes.4.Qomolangkais8,884.43_(meter)high.5.TheUSisoneoftheyoungest_(country)intheworld.,biggest,longer,deepest,meters,countries,二、完成句子,1a.Comparefactsaboutthesetwoanimals.Usethelanguageintheboxtohelpyoumakesentences.,Examplesentence:Thiselephantweighsmanytimesmorethanthispanda.(200cmtaller/shorter,weighmuchmore/less,eatmuchmore/lesseatmanytimesmore),Thiselephantis200cmtallerthanthispanda.Thiselephanteatsmuchmorethanthispanda.,1b.Listenandcheck()thenumbersyouhear.,_100_16_20_50_120_0.1_0.2_150,1.Atbirth,ababypandaisabout_to_kilos.2.Atbirth,ababypandaisabout_cmlong.3.Ababypandaisnotblack.Itis_andithasno_.4.Apandacanliveupto_to_years.,1c.Listenagainandcompletethesentences.,pink,0.2,15,0.1,teeth,20,30,1d.Writeashortpassageaboutpandas.