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1、Unit7What’sthehighestmountainintheworld?SectionA3(Grammarfocus—4c)Grammarfocus—What’sthehighestmountainintheworld?—Qomolangma.—HowhighisQomolangma?—It’s8,844.43metershigh.It’shigherthananyothermountain.—Whichisthedeepestsaltlakeintheworld?—TheCaspianSeaisthedeepest
2、ofallthesaltlakes.—DidyouknowthatChinaisoneoftheoldestcountriesintheworld?—Yes,Idid.It’smucholderthantheUS.Step1Grammar形容词和副词比较级和最高级变化规则1.规则变化1)一般情况下，单音节或双音节的形容词（或副词）比较级＋er，最高级＋est如：clever－cleverer－cleverestfew－fewer－fewestsmall－smaller－smallest等。2)以e结尾的词，比较级＋r，最高级
3、＋st即可。如：nice－nicer－nicestcute－cuter－cutestlarge－larger－largest3)以辅音字母＋y结尾的变y为i＋er或est。如:easy－easier－easiesthappy－happier－happiest再如：early,busy,heavy,dirty,lazy也如此。少数单音节词也是这样，如：pleased－morepleased－themostpleasedtired－moretired－themosttired2.不规则变化：good—better—bestwel
4、l—better—bestbad－worse－worstmany/much—more—mostfar—farther—farthest(距离远)far—further—furthest(程度深)old—elder—eldest(长幼)old—older—oldest(年龄)Step2中考链接1.比较级考点①比较级修饰问题alittle,abit,even,still,much,alot,far等可修饰比较级。e.g.TomisalittletallerthanJim.Thisbookismuchmoreinteresting
5、thanthatone.②同级比较e.g.TheweatherinBeijingiscolderthanthatinXi’an.Ourschoolisbiggerthanyours.③the+比较级e.g.Lucyisthefatterofthetwogirls.④“a/an+比较级” 表示“又一，再一”e.g.Lilyhasadoll,butshewants abiggerone.⑤隐性比较（没有than的情况）e.g.Whorunsfaster,LucyorLily?You’dbettercomeearliernextt
6、ime.Heworkedhardlastterm,butheworksevenharderthisterm.⑥越来越......a.比较级+and+比较级b.the+比较级+句子，the+比较级+句子a.e.g.It’sgettingcolderandcolder.Themoreyouexercise,thebetteryouare.2.最高级考点说明：形容词的最高级前必须加the;副词的最高级前省略the。①范围问题e.g.Tomisthetalleststudentintheclass.Springisthebestse
7、asonoftheyear.②“......之一”问题e.g.Beijingisoneofthebiggestcitiesintheworld.③“the+序数词+最高级”e.g.Ithinkheisthesecondtallestboyinhisclass.3.比较级和最高级的转换e.g.Tomisthetalleststudentintheclass. =Tomistallerthananyotherstudentintheclass. =Tomistallerthanalltheotherstudentsinthe
8、class. =NootherstudentsaretallerthanTom.2.同级比较①as+adj./adv.+ase.g.SheisasthinasLily.HewritesascarefullyasLinda.②not+as/so+adj./adv.+ase.g.Tonydi
