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1、Unit7What'sthehighestmountainintheworld?Grammarfocus—What’sthehighestmountainintheworld?—Qomolangma.—HowhighisQomolangma?—It’s8,844.43metershigh.It’shigherthananyothermountain.—Whichisthedeepestsaltlakeintheworld?—TheCaspianSeaisthedeepestofallthesaltlakes
2、.—DidyouknowthatChinaisoneoftheoldestcountriesintheworld?zxxk—Yes,Idid.It’smucholderthantheUS.大多数形容词有三个级。1.原级:Structure:as...as...像..….一样e.g.TimisastallasTom.2.比较级(用于两者之间的比较):Structure:形容词比较级+than...e.g.Thisboxisbiggerthanthatone.形容词和副词的比较级和最高级3.最高级(用于三者或三
3、者以上的比较):Structure:the+形容词的最高级+of/in...e.g.Tomistheheaviestinourclass.Heisthemostpopularinourschool.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:clever—cleverer—cleverestfew—fewer—fewestsmall—smaller—smallest等。形容词、副词的比较级和最高级规则变化和不规则变化2)以e结尾的词,比较级+r,最高级+st即可。
4、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。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:①fat—fatter—fattest②thin—thinner—thinnest③hot—hotter—hottest④red—re
5、dder—reddest⑤wet—wetter—wettest⑥big—bigger—biggestzx。xk5)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,+themost构成最高级。如:beautiful-morebeautiful-themostbeautiful又如:delicious,popular,important,interesting,expensive,creative双音节的词如:careful-morecareful-themostcarefuluseful-m
6、oreuseful-themostuseful少数单音节词也是这样,如:pleased—morepleased—themostpleasedtired—moretired—themosttiredb)不规则变化:good—better—bestwell—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—olde
7、st(年龄)二、用法1.比较级表示两者(人或事物)的比较。eg.IamtallerthanTom.Mydressismorebeautifulthanhers.2.最高级表示三者或三者以上(人或事物)的比较,其中有一个在某一方面超过其他几个时,用最高级。最高级的前面一般要加定冠词the,后面可带of(in)短语来说明比较的范围。如:Sheistheyoungestintheclass.Jasonisthetallestofthethree.Whosehandwritingisthebestofall?3.在
8、形容词比较级前还可用much,even,still,alittle来修饰,表示“……的多”,“甚至……”,“更……”,“……一些”。如:Thiscityismuchmorebeautifulthanbefore.She’salittlemoreoutgoingthanme.It’salittlecoldertoday.4.“比较级+and+比较级”意为“越来越……”。多音节比较级用“moreandmore+形容词