江苏省盐城东台市唐洋镇英语二轮复习 数词学案.doc

江苏省盐城东台市唐洋镇英语二轮复习 数词学案【学习目标】1.掌握数词的含义 2.掌握数词在各种语境中正确应用【重点难点】 1，基数词与序数词的概念 2, 基数词如何转换成序数词 3, 如何在各种语境中正确应用数词【预习指导】 一，什么是基数词？ （表示人或事物数目的词叫基数词。）n 基数词的构成1-12的数, 这些数词在中考中出现的频率较高，需要识记1 one 2 two 3 three 4 four 5 five 6 six7 seven 8 eight 9 nine 10 ten 11 eleven 12 twelve13-19的词（这些词要注意观察，根据规律teen记忆）13 thirteen 14 fourteen 15 fifteen 16 sixteen17 seventeen 18 eighteen 19 nineteen20-90整十的数这些词要根据规律ty记忆，中考中出现频率较高的是twenty,forty,fifty,ninety20twenty 30thirty 40forty 50fifty60sixty 70seventy 80eighty 90ninety 100one hundred几十几的两位数（由整十的数加“-”加1-9的个位数21 twenty-one 34 thirty-four 36 thirty-six 48 forty-eight53 fifty-three 67 sixty-seven 72 seventy-two 75 seventy-five85 eighty-five 88 eighty-eight 98 ninety-eight 99 ninety-nine三位数（百位后加hundred,百位和十位之间用and连接，十位和个位之间用几十几的读法和写法）125 one hundred and twenty-five368 three hundred and sixty-eight450 four hundred and fifty888 eight hundred and eighty-eight999 nine hundred and ninety-nine108 one hundred and eight509 five hundred and ninen 百hundred, 千thousand, 百万million, 十亿billionn 四位数或四位以上的数, 先从右往左数，每三位用“，”隔开，第一个“，”表示thousand, 第二个“，”表示million, 第三个“，”表示billion, 逗号与逗号之间用几百几十几的表达方法。3333333333333，333，333，333thirty-three billion, three hundred and thirty-three milliom, three hundred and thirty-three thousand, three hundred and thirty-three 570208944059570,208,944,059five hundred and seventy billion, two hundred and eight milliom, nine hundred and forty-four thousand, and fifty-ninen 表示具体，准确的数时，hundred, thousand, milliom, billion等词后面不能加”s”, 如：five hundred students, nine thousand people, two millionn 当表示不具体，不准确的数时，加“s”，与”of”连用。如：hundreds of students, millioms of trees二，什么是序数词？n 表示人或事物顺序的词叫序数词。one first two second three third four fourthfive fifth six sixth eight eighth nine ninth twelve twelfth thirteen thirteenth fourteen fourteenth eighteen eighteenthnineteen nineteenth twenty twentieth eighty eightieth ninety ninetieth one hundred one hundredth如何将基数词转换成序数词？(口诀)n 基变序，有规律n 末尾加上“th” four-fourthn 一二三，特殊记 first second thirdn “ve”要用“f”替 five-fifth twelve-twelfthn 八去“t”,九去“e” eight-eighth nine-ninthn 末尾“y”变“ie” twenty-twentiethn 如果遇到几十几n 只变末位就可以 thiety-one-thirty-first eighty-five-eighty-fifth当序数词用阿拉伯数字表示时，必须在数字后加上相应序数词的最后两个字母，如：n 5353rd 598 598th序数词前一般要用定冠词”the”，如果序数词前用“a”,“an”，则表示“再一，又一”（没有具体的范围限制）though he had failed twice, he wanted to try a third time.the little monkey had had three apples, and he wanted a fourth one.他还想再吃一个三，数词在具体语境中的使用编号lesson 5 room 608 class two, grade nine row 3 number 8时间表达法n 9:00 nine oclockn 8:20 eight twenty twenty past eightn 9:55 nine fifty-five five to tenn 11:30 eleven thirty half past elevenn 7:45 seven forty-five a quarter to eightn 6:15 six fifteen a quarter past six表示“几十年代”，“几十岁”n in the 1870s 在十九世纪七十年代 in the 1990s 在二十世纪九十年代n in ones thirties 在某人30多岁时 in her eighties 在她80多岁时“几个半” 表达法n 1.数词and a half名词复数2.数词名词复数and a half如：three and a half days three days and a half one and a half apples one apple and a half分数n 分子基数词，分母序数词，分子大于1，分母加“s” 这些词的考查往往与主谓一致相联系 2/5 two fifths 1/9 one ninth 3/8 three eighths 3/4 three fourths three quarters表示次数n 一次once 两次twice 三次three times 四次four timesn 每多久一次 every+基数词+名词复数 如：每四年一次every four years=every other three yearsn we have chemistry classes _ day, monday, wednesday and friday. a. each other b. every other c. this and other d. all other每隔一天every other day倍数n 表“几倍大小（长短，数量）”，由“倍数+ the size(length,amount)”构成 the earth is forty-nine times the size of