单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,NUMBERS AND,QUANTITIES,NUMBERS AND,Read and Answer,1.HIV infections are increasing at a meaningful rate,among migrant workers in Mexican.(),2.What was the rate of HIV infections among women,giving birth at Tijuana General Hospital?,T,The rate was four times higher than that in the,general population of either country.,3.As much as 2000 people are infected with HIV,，,according to the results of a study of 600 migrant,workers in Californias Fresno and San Diego,counties.(),F,Read and Answer1.HIV infectio,数词,1.,定义：表示数量或顺序的词叫做数词。,2.,分类：表示人或事物数量多少的数词叫,基数词，如,one,，,two,，,three,，,ten,等；表示,人或食物顺序的数词叫序数词，如,first,，,second,，,fourth,等。,数词1.定义：表示数量或顺序的词叫做数词。2.分类：表示人或,A.,基数词,1.,构成：,(1)112,记成,：,one,，,two,，,threetwelve,。,(2)1319,词尾为,teen,，,thirteen,，,fourteen,，,fifteen,(3)20,，,30,，,40,逢,10,词尾为,ty,，,twenty,，,thirty,(4)2199,十位数字和个位数字之间加连词符,，,twenty-one,(5)101999,先说几百,，,再加,and,，,再加末尾两位数,(,末位数,),eg,：,178 one hundred and seventy-eight.,(6),大数的表达,：,hundred,，,thousand,，,million,等词在表示,具体数量的时候用单数；表示“成,上,”要用复数，,例如,；,thousands of,成千上万的,A.基数词1.构成：,2.,位置：,(1),位于,another,，,all,之后，如,：,Can I have another,two,cakes,？,(2),可置于,last,，,next,，,other,之前或之后，如：,His last,two,books are,written in English.,=His,two,last books are written in English.,他的后两本书是用英语写的。,2.位置：,B.,序数词,1.,常见的序数词：,first-1,st,；,second-2,nd,；,third-3,rd,；,thirty-first-31,st,。,2,.,序数词的构成方法口诀,:,一，二，三要全变；,(,one-first;two-second;three-third),其余都加,th,th,里有例外，,8,去,t,(,eight-eighth),9,去,e(nine-ninth),字母,f,代,ve(five-fifth;twelve-twelfth);ty,变成,tie(twenty-twentieth),若要变化几十几，只变个位就可以,(twenty-one,twenty-first),B.序数词1.常见的序数词：first-1st；seco,3.,用法：,(1),一般情况下，序数词前面要加定冠词,the,例：,I have already got two letters from Susan this year,so,this is,the,third one.,(2),序数词前加定冠词和冠词的区别：,例：,Ill go to Beijing,a third time,next month.,（已,经去过两次了。,I have a fourth apple.,（我已经吃了三个，又,吃了一个，,a fourth one.,）,The third time,I went to Beijing was in 1998.,3.用法：,C.,英语中小数、百分数和分数的表达,1.,分数：分数的构成总则为：分子用基数词，分母用,序数词，中间用连词符连接。,分子为,1,的分数，分子用基数词，分母用序数词，如：,1/3,one-third 1/3 one-fourth,分子大于,1,的分数，分母的序数词要加,s,，如：,2/3 two-thirds 3/5 three-fifths,带分数的表示：基数词,+and+,分子基数词,+,分组序数词，,如：,2,又,3/5 two and three-fifths,1,又,1/2 one and a half,分子与分母都较大的时候，用,over,来表示，如：,22/9 twenty-two over nine,C.英语中小数、百分数和分数的表达1.分数：分数的构成总则为,2.,百分数,百分数的表示法为：,基数词,+,%,，百分号读作,percent,。,89%-eighty-nine percent,100%-one hundred percent,3.,小数,小数的表示法和汉语中的小数表示法一样，小数点后,面的数字是“见几读几”，点用,point,来表示。,0.125-zero,（或者,o,）,point one two five,27.832-twenty-seven point eight three two,2.百分数 百分数的表示法为：基数词+%，百分号读作perc,D.,英语中动物的“群体”有多样化的表达，不同,的词语表达不同的动物。,a colony of,：,群居在一起的动物,。,如,：,a colony,of ants,a flock of,：,一起吃食或行走的兽群，尤指羊群,。,如,：,a flock of sheep,a herd of,：,一起吃食或行走的兽群，尤指牛群,。,如,：,aherdofcattle,a school of,：,共游的鱼群。如：,aschooloffish,an army of,：,大队，大群。如：,anarmyof,workmen.,D.英语中动物的“群体”有多样化的表达，不同 a colon,E.,表示容量或形状的短语可以表达不可数,名词的量。,a bag of,：,一袋。如,：,abagoftoffees.,a,jar of,：,一罐,。,如：,a jar of jam,a roll of,：,一卷。如,：,a roll of paper,a loaf of,：,一条。如,：,a loaf of bread,a strip of,：,狭长的一条。如,：,a strip,of land,E.表示容量或形状的短语可以表达不可数a bag of：一袋,F.,表示不定数量的常用词组。,用于可数名词,用于不可数名词,可数名词和不可数名词均可用,a bit of,(a)few fewer,(a)little,all,(the)fewest,less,a,lot of,；,lots of,several,；,many,deal,enough,a(great)number of,a great of,plenty of,dozens of,(the)least,some,；,any,much,F.表示不定数量的常用词组。用于可数名词用于不可数名词可数名,G.,表示长、宽、高、重量、体积时，需要,用特定词组或特定结构。,in size,：,在大小，尺寸方面。如：,It is equalin sizeto,a turkey.,in length,：,在长度上。如,：,What is that,ten,centimetersinlength?,in depth,：,在深度上。如：,Contradictions grow in,breadth andin depth.,in area,：,在面积上。如：,Although large,in,area,the,flat did not have many rooms.,in width,：,在宽度方面。如：,The ship is sixty feet in,width.,G.表示长、宽、高、重量、体积时，需要in size：在大小,H.,约数表达法,1.,“大约”用,about,，,nearly,，,around,来表示。如：,The pig weighs about 80 pounds.,2.,“多于，超过”用,over,，,more than,来表示。如：,The bridge is over 150 meters long.,3.,“少于，不超过”用,less than,来表示。如：,She is less than twenty years old.,4.,“左右”用,or so,来表示。如：,In the past fifty years or so,scientists have,been able to,“,see,”,farther and farther into,the sky.,H.约数表达法1.“大约”用about，nearly，ar,Lets check,1.I wonder of I ask him()time.,A.four B.fourth C.the fourth D.a fourth,解析：序数词前面加不定冠词表示“又一次”。,2.He came out()in the track events.,A.first B.one C.the first D.the one,解析：这里,first,可以看成表语，也可以看作一种“,取得第一名,”,的习惯看法。,3.He was only in()at the time.,A.in his 20s B.the 20s,C.his twenties D.the twenties,C,D,A,Lets check1.I wonder of I as,Homework,熟记本课时的重要单词与句型并各默写五遍。,Homework 熟记本课时的重要单词与句型并各默写五,GOOD BYE!,GOOD BYE!,