Unit7语法grammar大数表达和比较级最高级-2024-2025学年人教版英语八年级下册

Can you read the numbers below? 98 ninety-eight 125 one hundred and twenty-five 1,025 6,671 8,848.86 9,600,000 one thousand and twenty-five six thousand six hundred and seventy-one eight thousand eight hundred and forty-eight point eight six nine million six hundred thousand 0.1 zero point one 1000以上的基数词的表达法(大数表达法) 从个位数起，每三位数前加一个逗号， 第一个逗号前的数为...thousand(千) 第二个逗号前的数为...million(百万) 第三个逗号前的数为...billion(十亿), 每三位数隔开后就都成了三位数，读的时候按百位数读。 （从左至右三位三位地读，每读完一个三位数单元，加上billion/million/thousand)(小数点读point) 小数点右面的小数部分按照个位基数词依次读出； 小数点后面遇到0时，可读zero，可读字母O。 1,000 10,000 100,000 1,000,000 10,000,000 100,000,000 1,000,000,000 10,000,000,000 100,000,000,000 thousand million billion 1000以上的基数词的表达法(大数表达法) 从个位数起，每三位数前加一个逗号， 第一个逗号前的数为...thousand(千) 第二个逗号前的数为...million(百万) 第三个逗号前的数为...billion(十亿) （注意：1. 英语中没有“万”这个单位，表示“万”要借助“千(thousand)”） 一万：ten thousand 两万：twenty thousand 十万: one hundred thousand （注意：2. hundred后通常要加上and 156 one hundred and fifty-six 101 one hundred and one) （注意：3. 若百位数为0，则在thousand后加and (thousand和十位数之间加and) 1,125 one thousand one hundred and twenty-five 1,025 one thousand and twenty-five 111,121,435,678 billion million thousand one hundred and eleven billion one hundred and twenty-one million four hundred and thirty-five thousand six hundred and seventy-eight 2,506,981,065.34 billion point thousand million and and and two billion five hundred and six million nine hundred and eighty-one thousand and sixty-five point three four two billion five hundred and six million nine hundred and eighty-one thousand and sixty-five point three four 6 250,000,000 two hundred and fifty million 3,456,789,012 three billion four hundred and fifty-six million seven hundred and eighty-nine thousand and twelve 987,654,321,012.65 nine hundred and eighty seven billion six hundred and fifty four million three hundred and twenty one thousand and twelve point six five 7 Let’s read numbers 2.3 45 165 6,671 600,000 9,600,000 1,300,000,000 two point three forty-five one hundred and sixty-five six thousand six hundred and seventy-one six hundred thousand nine million six hundred thousand one billion three hundred million billion 十亿 million 百万 thousand 千 大多数形容词和副词有三个级,原级，比较级和最高级。 be+形容词原级/比较级/最高级 实义动词+副词原级/比较级/最高级 一、形容词/副词的原级 当相比较的两者/部分在程度上相同时，用原级比较。 1.肯定结构:as+形容词/副词原级+as 和...一样(也可用both) Lucy和Lily一样高。 Lucy is as tall as Lily. Lucy和Lily跑得一样快。 Lucy runs as fast as Lily. 2. 否定结构:not as/so+形容词/副词原级+as 不像...那样 (less+形/副+than) Lucy不像Lily那样高。 Lucy is not as/so tall as Lily. Lucy不像Lily跑得那样快。 Lucy doesn't run as/so fast as Lily. 原级修饰词： very, so, really, too(太), pretty=quite (相当,非常, 十分,很)等。 二、形容词/副词的比较级 当两者/部分相比较，表示...比...更...时，应用比较级。相比较的两者/部分必须是属于同一性质或范畴的人或物。 2. 比较级用法 (1)比...更...：“比较级+than” I’m older than Lucy. (2)越...,越...：“the+比较级...,the+比较级...” the earlier, the better (3)越来越... “比较级+and+比较级” hotter and hotter more and more +形容词或副词原级 more and more interesting It’s getting worse and worse. The group became more and more popular. (4) Which / Who + 比较级，A or B？ 比较A、B两事物, 问其中哪一个较……时用此句型。如： Which T-shirt is nicer, this one or that one? Who runs faster, Mary or Kate? Which season do you like better, spring or winter? 3. 形容词/副词比较级的修饰语 比较级前常有much,far,a lot,even,a little, a bit(一点), 倍数等修饰，表示两者/部分差异程度的大小。 much/a lot/far+比较级：...得多 a bit/a little+比较级：稍微... even+比较级：甚至更... This city is much more beautiful than before. She’s a little more outgoing than me. It’s a lot colder today. 最高级 当对三者或三者以上（人或物）进行比较（其中有一个超过其他几个），表示“最…”的含义时，需要用最高级,后面可用of/in短语等来说明比较的范围。 2. 形容词最高级的前面一般要加定冠词the，副词最高级前的the可以省去。 the funniest the most interesting (the) fastest (the) most quickly （若形容词前有形容词性物主代词或名词所有格等修饰时，则不需要加the：my best friend, my sister’s worst picture） 13 规则变化:词尾变，词前变 情况 变化形式 举例 一般情况 在词尾直接加-er/-est small—smaller-smallest 以e结尾 加-r/-st large—larger-largest 重读闭音节词词尾只有一个辅音字母时 先双写辅音字母再 + er/-est fat—fatter-fattest (big, thin, sad, hot, wet, red) 以辅音字母y结尾的双音节词 变y为i，再加 -er/est happy—happier-happiest 多音节和部分双音节词 在原形前加more/most beautiful—more beautiful-most beautiful 形容词和副词比较级和最高级的变化规则 less/least friendly friendlier friendliest early earlier earliest 句型大闯关 不规则变化 原级 比较级 good/well better-best bad/badly worse-worst many/much more-most little less-least far farther-farthest further-furthest 最高级用法（常用句型） 最高级+in/of短语：…是…中最…的。 Tom is the tallest in his class. Tom is the tallest of all the students. I jump (the) highest in my class. I jump (the) highest of all the students. (in/of短语表示最高级的比较范围。如果主语与介词短语中的名词属于同一类，用介词of，如果不属于同一类，则用介词in） of同类，in不同类 16 2. 主语+be + one of the+形容词最高级+可数名词复数+in/of短语：…是…中最…的之一。 Beijing is one of the largest cities in China. 3. the+序数词(除了first)+形容词最高级+可单：第几最…的 The Yellow River is the second longest river in China. 4. Which/Who+最高级，A, B or C? Which country is the largest, China, America or Canada? Which season do you like (the) best, spring, summer or autumn? 17 5. 比较级+than any other +可数名词单数： 比其他任何一个…都更… (比较级表达最高级含义) China is larger than any other country in Asia. =China is the largest country in Asia. =China is larger than the other countries in Asia. omit: 最高级可被序数词等修饰。 Africa is the second largest continent. 非洲是第二大洲。 =比较级+than the other +可数名词复数： 比其他的...都更... 18 He is a little______(thin) than you, but he is as_____(strong) as you. 2. The _____(early) kids learn to be independent, the _____(good) it is for their future. 3. Mr. Wang is friendly to us. He is________(kind) of all the persons I know. 4. -I think it’s necessary to learn how to work in groups. -I quite agree. Sometimes it’s even_____________(important) than grades. 5. If more people give up driving cars, the air will get much_______(clean) in a few years. 6. –What do you think the film you saw yesterday? -It’s one of _______________(interesting) films I’ve ever seen. 7. Lake Qinghai is larger than____salt lake in China. another B. any other C. the other D. others 8. I think that Eric writes as________(careful) as Betty. 9. Guangzhou is one of ________(big) cities in China. thinner strong earlier better the kindest more important cleaner the most interesting B carefully the biggest 19 10. _________(high) the mountain is, _________(thin) the air is. 11. Our country is getting___. We’re proud of it. strong and strong B. more and more strong C. stronger and stronger D. more and more stronger 12. The farmers are living a much______(happy) life than before. 13. Sam is 11 years old. Peter is 16 years old. Peter is 5 years _____than Sam. 14. He is not as tall as Mike.=Mike is _____ _____ him. 15. –Do the twins look the same?-No, Jane is___taller than Claire. little B. more C. a little D. very 16. Youth is a wonderful film. I’ve never seen a__one before. worse B. better C. best D. worst 17. Her bag is heavy, and his is ______ than hers. But yours is ___________ of all. 18. Hainan is a very large Island .It is the second ______ (large) island in china. 19. Our teacher is as ______(busy) as before. The higher the thinner C happier older taller than C B heavier the heaviest largest busy 20 21. Lin Tao is ________________________in the class because he never gets to school on time.(最懒的学生之一) 22. The red dress is more expensive than the yellow dress. The yellow dress is _____ __________ than the red dress. The yellow dress is ________ _______ the red dress. The yellow dress is not ____ __________ ___ the red dress. 23. He is the tallest student in the class. He is _________________________ in the class. 24. Who is ______(smart), your mother or your father? Who runs _______(fast), Lucy, Lily or Alice? 25. He writes ____________(careful) of all the students in his class. one of the laziest students 20. The Yangtze River is__________________ river in the world. (第三长河） the third longest taller than any other student less expensive cheaper than as expensive as smart (the) fastest (the) most carefully 21 $$