初中英语八年级下册SectionAGrammarfocusa-4c“衡水杯”一等奖

SectionAGrammarfocus4a—4cUnit7What'sthehighestmountainintheworld?SectionA3Grammarfocus~4cGrammarfocus—What’sthehighestmountainintheworld?—Qomolangma.—HowhighisQomolangma?—It’s8,844.43metershigh.It’shigherthananyothermountain.—Whichisthedeepestsaltlakeintheworld?—TheCaspianSeaisthedeepestofallthesaltlakes.—DidyouknowthatChinaisoneoftheoldestcountriesintheworld?—Yes,Idid.It’smucholderthantheUS.学习目标：复习巩固有关形容词副词比较级和最高级构成及常用句式。了解形容词副词不同级别间的

句式转换。了解倍数表达法。

规则变化

1)一般情况下，单音节或双音节的形容词/副词比较级＋er，最高级＋est。如:形容词、副词的比较级和最高级规则变化和不规则变化cleverer---cleverestclever---small---smaller---smallest2)以e结尾的词，比较级＋r，最高级＋st

即可。如：easy---easier---easiesthappy---happier---happiest

cute---cuter---cutestlarge---larger---largest3)以辅音字母＋y结尾的变y为i＋er或est,如：再如：early,busy,heavy,dirty,lazy也如此。4)重读闭音节，单辅音结尾的，双写这个辅音字母＋er

或

est的词：fat---fatter---fattest

wet---wetter---wettestthin---thinner---thinnest

5)多音节和部分双音节的词需要在形容词原级前＋more构成比较级，＋most构成最高级。如：beautiful---morebeautiful---mostbeautiful又如:delicious,popular,important,interesting,expensive,creative双音节的词如:careful---morecareful---mostcarefulb)不规则变化：

good/well---better---bestbad---worse---worstmany/much---more---most大多数形容词和副词有三个级。1.原级:Structure:as...as...像..….一样e.g.Timisas

tallas

Tom.2.比较级(用于两者之间的比较):Structure：形容词副词比较级＋than...e.g.Thisboxisbigger

thanthatone.形容词和副词的比较级和最高级3.最高级(用于三者或三者以上的比较):Structure:the+形容词副词的最高级＋of/in...

e.g.Tomistheheaviestinourclass.

Heisthemostpopularofus.GroupWork:Writethreesentencesaboutourschool,usingadjectives,comparativesandsuperlativesWriting思考：不同级别间的转换1.MaryismorepopularthanBob.

=BobislesspopularthanMary.=Bobisnotso/aspopularasMary.2.Jackisclevererthananyotherstudentinourclass.=Jackisclevererthantheotherstudentsinourclass.=Jackistheclevereststudentinourclass.=NootherstudentsareclevererthanJackinourclass.总结：1.more…than与less…than,notas/so…as可以互相转化。2.“比较级+than+anyother+可数名词单数”或“比较级+than+theother+可数名词复数”可转化为最高级。思考：倍数表达法Ababypandais15cmtall.Anadultpandais150cmtall.Examplesentence:Anadultpandaistentimesastallasababypanda.Anadultpandaisninetimestallerthanababypanda.

总结：倍数表达法常用句式1.A+动词+倍数+as+形容词/副词原级+as+B.2.A+动词+倍数+形容词/副词比较级+than+B.

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