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1、八年级英语上册八年级英语上册Unit7Unit7Language GoalTalk about geography and nature.The Caspian Sea The Caspian Sea is the biggest lake in the world.It lies in the border between Asia and Europe.The Sahara is the biggest desert in the world.It is located in the northern Africa,climate conditions are very bad,is on
2、e of the earths most not suitable for biological survival.The Sahara1a Match the facts you know.Qomolangmaabout 9,600,000 square kilometers in sizethe Sahara1,025 meters deepthe Caspian Sea6,671 kilometers longthe Nile8,844.43 meters highsquare n.平方平方meter n.米米deep adj.深的深的desert n.沙漠沙漠population n.
3、人口人口Asia n.亚洲亚洲tour v.n.旅行旅行tourist n.旅行者旅行者wall n.墙墙amazing adj.令人大为惊奇的令人大为惊奇的ancient adj.古代的古代的wide adj.宽的；宽阔和宽的；宽阔和1b 比较级与最高级比较级与最高级1.Qomolangma is _ than any other mountain in the world.2.The Sahara is _ desert in the world.3.The Caspian Sea is _ of all the salt lakes.4.The Nile is _ river in th
4、e world.higherthe biggestthe deepestthe longest大多数形容词有三个级。大多数形容词有三个级。1.原级原级:Structure:as.as.像像.一样一样 e.g.Tim is as tall as Tom.2.比较级比较级(用于两者之间的比较用于两者之间的比较):Structure：形容词比较级形容词比较级 than.e.g.This box is bigger than that one.3.最高级最高级(用于三者或三者以上的比较用于三者或三者以上的比较):Structure:the+形容词的最高级形容词的最高级of/in.e.g.Tom is
5、the heaviest in our class.He is the most popular in our school.规则变化规则变化 1)一般情况下，一般情况下，单音节或双音节的形容单音节或双音节的形容词词/副词比较级副词比较级er，最高级最高级est。如。如:clever cleverer cleverest few fewer fewest small smaller smallest 等。等。2)以以e结尾的词结尾的词，比较级比较级r，最高级最高级st 即可。即可。如：如：nice nicer nicest cute cuter cutest large larger larg
6、est 3)以以辅音字母辅音字母y结尾的结尾的变变y为为ier或或est 如如:easy easier easiest happy happier happiest 再如：再如：early,busy,heavy,dirty,lazy 也如也如此。此。4)重读闭音节，单辅音结尾的，重读闭音节，单辅音结尾的，双写这双写这个辅音字母个辅音字母er 或或 est的词：的词：fat fatter fattest thin thinner thinnest hot hotter hottest red redder reddest wet wetter wettest big bigger biggest
7、 5)多音节和部分双音节的词多音节和部分双音节的词需要在形容词需要在形容词原级前原级前more 构成构成比较级比较级，the most 构构成成最高级最高级。如：。如：beautiful more beautiful the most beautiful 又如又如:delicious,popular,important,interesting,expensive,creative双音节双音节的词如的词如:careful more careful the most careful useful more useful the most useful少数单音节词少数单音节词也是这样，如：也是这样，
8、如：pleased more pleased the most pleased tired more tired the most tired b)不规则变化：不规则变化：good better best well better best bad worse worst many/much more most 1.三者或三者以上相比，表示最高程度三者或三者以上相比，表示最高程度时，用时，用“the+最高级最高级”的结构表示。的结构表示。这种句式一般常有表示比较范围的介这种句式一般常有表示比较范围的介词短语。例如：词短语。例如：Zhang Hua is the tallest of the th
9、ree.He works(the)hardest in his class.2.最高级可被最高级可被序数词序数词以及以及 much，by far，nearly，almost，by no means，not quite，not really，nothing like 等词语所等词语所修饰。例如：修饰。例如：This hat is by farmuchnearlyalmostnot nearlyby no meansnot quitenothing like the biggest.How much did the second most expensive hat coat?3.表示表示“最高程
10、度最高程度”的形容词，如的形容词，如 excellent，extreme，perfect等，没有最高等，没有最高级，也不能用比较级。级，也不能用比较级。4.形容词最高级修饰作表语或介词宾语的形容词最高级修饰作表语或介词宾语的名词、代词时，被修饰的词往往省略。名词、代词时，被修饰的词往往省略。e.g.He is the tallest(boy)in his class.5.作状语的副词最高级前可以不加定冠词。作状语的副词最高级前可以不加定冠词。e.g.Of all the boys he came(the)earliest.Make conversations.Make conversations.结束结束