2021年七年级上册英语人教版-数词《讲义教师版》

人教版-七上-专题-数词知识元基数词知识讲解数词之基数词的用法••一、数词定义：表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。

••二、基数词1.1. 定义：表示数目多少的数词叫基数词。

2.3.2. 构成：（1）1-20；one, two, three, four, five,six, seven, eight, nine, ten,eleven, twelve, thirteen, fourteen, fifteen,sixteen, seventeen, eighteen, nineteen, twenty（2）21-9923→twenty-three, 34→thirty-four, 45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine, 91→ninety-one（3）101—586→five hundred and eighty-six,803→eight hundred and three（4） l,000以上,先从右往左数，每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion（美式）或thousand million（英式）,然后一节1,005→one thousand and five9,687→nine thousand, six hundred and eighty-seven16,324→sixteen thousand, three hundred and twenty-four8,370,308→eight million, three hundred and seventy thousand, three hundred and eight980,000,000,000→nine hundred and eighty, bi llion （美式） →nine hundred and eighty thousand million （英式）4. 4.具体用法：（1）用在一些表示“一排”或“一组”的词组里 They arrived in twos and threes.（2）表示人的岁数或年代。

He is in his early thirties.This took place in the 1930s/ 1930’s.（3）表示时刻：钟点表达法。

钟点表达法顺读法(钟点＋分钟)4:30 four thirty 4:45 four forty-five 倒读法(分钟＋to ／past ＋钟点) 4:30 half past four 4:15 fifteen past four ／a quarter past four4:45 fifteen to five ／a quarter to five（4）小数的读法：小数点读作"point"，小数后各位数分别读出来，小数点前的数若为"0"可略去不读。

2.468 读作：two point four six eight0.157 读作：（zero ）point one five seven例题精讲基数词主语 Four of them come from Paris. 宾语 —How many books would you like ？ —I would like two.表语 Seven minus two is five.定语 There are three people in my family. 同位语You two will go swimming with us.例1.— How many students are there in your class?【解析】题干解析:例2.I’m 13 years old and my sister is 15 years old. So my sister is ______ yea rs old than【解析】题干解析:【解析】题干解析:【解析】题干解析:D．in the sixty【答案】B【解析】题干解析:序数词知识讲解数词之序数词的用法1.一、定义：2.表示顺序的数词叫序数词。

3.4.二、构成：（1）不规则变化one→ first, two→ second, three→ third, five→ fifth,eight→ eighth, nine→ ninth, twelve → twelfth （2）一般在基数词后加th four → fourth; thirteen → thirteenthtw enty→ twentieth, forty→ fortieth, ninety→ ninetieth （3）以y结尾的十位整数，变y为ie再加thtwenty-first, two hundred and forty-fifth（4）二十一后的数“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。

三、用法：1.序数词作定语时，一般要与定冠词或物主代词连用。

Tom is their second son.He is the first one to come here.2.序数词有时可与不定冠词连用，表示“又一”,“再一”He tried a second time.Shall I ask him a third time？3.序数词的缩写形式为：阿拉伯数字加上其末尾两个字母。

1st, 2nd, 3rd, 4th, 20th, 21st, 22nd, 23rd.4.表示年、月、日时，年用基数词，日用序数词。

2005年8月15日：（英）15,8,2005=15th,August,2005；（美）8,15,2005=August 15th,20055.基数词和序数词都可以用来给数字编号.第二课：The second lesson=Lesson Two第305房间：Room three o（零）five长安街76号：seventy-six Chang’an Street电话号码：204-2244：telephone number two o（零）four two two (double two) four four十一路公共汽车：Bus（No.）eleven例题精讲序数词例1.1.January is _______ month of the year.A．one B．the oneC．first D．the first【解析】题干解析:例2.1.— On which floor do you live?—The _______ floor, and my room number is _______.A．fifth; five zero twoB．fifth; five zero secondC．five; five zero secondD．five; five zero two【解析】题干解析:A． twentieth, oneB．twenty, oneC．twentieth, firstD．twenty, first【答案】D【解析】题干解析:例4.There are _____days in a week and Wednesday is ____ day of the week.A．seven ,thirdB．seven ,the thirdC．seventh ,threeD．the seventh, three【答案】B【解析】题干解析:hundred/thousand等单复数用法知识讲解1.hundred/thousand等单复数用法2.3.1.表具体数字时,其后的hundred, thousand ,million用单数。

There are six hundred students in our grade.2.3.2.表不确定的数字时,数词用复数。

若带名词，再加of。

hundreds of（数百,成百上千的）thousands of（数干,成千上万的）millions of（数百万的）Thousands and thousands of people visited the city.例题精讲hundred/thousand等单复数用法例1.The computer was cheap. I spent only two _____ yuan on it.A．thousands B．thousandC．thousands of D．thousand of【答案】B【解析】题干解析:例2.______ visitors come to Xingyi during May Day holidays every year.A．Thousands of B．Two thousandsC．Thousand of D．Thousand【答案】A【解析】题干解析:例3.The chairperson received about three ______ applications to join the Bird Watching Club.A．hundred B．hundreds ofC．hundred of D．hundreds【答案】A【解析】题干解析:例4.Did you know that the earth is home to _____animals?A．million B．millionsC．million of D．millions of【答案】D【解析】题干解析:分数、百分数、倍数的用法知识讲解1.一、分数的表达2.分子用基数词，分母用序数词，分子大于1时，分母加s.1／3-one third；2／5-two fifths二、百分数基本结构为：基数词+ percent（单数形式）+of+名词。

Thirty percent of the students in my class are from cities.About 61 percent of the surface is covered by water.三、数学运算的表达3+5=8 Three plus／and five is eight.9-2=7 Nine minus two is seven.6×5=30 Five times six is thirty ／six unutilized five is thirty.8÷2=4 Eight divided by two is four.四、倍数的表达1.主语+谓语+倍数（或分数）+ as + adj. + asI have three times as many as you.2.主语+谓语+倍数（分数）+ the size (amount，length…) of…The earth is 49 times the size of the moon.3.主语+谓语+倍数（分数）+ 形容词（副词）比较级+ than…The grain output is 8 percent higher this year than that of last year.4.还可以用by+倍数，表示增加多少倍The production of grain has been increased by four times this year.数词易错点归纳（误）More than two thousands yuan was stolen last night.（正）More than two thousand yuan was stolen last night.5.分数用法易错点（误）I think two five of the students are working hard at theirlessons.（正）I think two fifths of the students are working hard at theirlessons.（误）About three fourth of water for villagers are from this lake.（正）About three fourths of water for villagers is from this lake.例题精讲分数、百分数、倍数的用法A． two thirdB．second threeC． two thirdsD．two three【解析】题干解析:A．as twice much asB．twice as much asC． as much as twiceD．as much twice as【解析】题干解析:A．three five; 2006B．three fifths; 2006C．third fifth; 2006D．third fifths; 2006【答案】B【解析】题干解析:例4.There are______ teachers in our school, _____of them are women teachers. A． two hundreds; three fourthB．two hundred; three fourthsC．two hundreds; three forthsD．two hundred; three four【答案】B【解析】题干解析:当堂练习单选题练习1.—What’s the time, please?—It’s _______.A． nine thirty-fiveB．forty-eight past sixC．fifty-five to fourD．thirty-one two【解析】题干解析:A． three hundreds sixty-fiveB． three hundred and sixty-fiveC．the third hundred sixty-fiveD．third hundred and sixty-five题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:练习9.—If a = 3 and b = 4, what’s the answer to the problem: a + b + 1 = ?【解析】题干解析:练习10.—Would you like to have _____ apples?【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:练习15.— Our school is going to hold the ____Culture Festival.【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:【解析】题干解析:练习25.After the Asian Games, ________ people came to Guangzhou for a visit during【解析】题干解析:练习26._______ students took the college entrance exam on time ________ the morning of June 7th in South China, though it rained heavily.【解析】题干解析:练习27.—Is there_______ in today’s magazine?【解析】题干解析:练习28.—Which is the biggest number of the four?【解析】题干解析:单句填空first; second ; third; fifth; eighth;ninth; twelfth; fourteenth; twentieth;twenty-first; fourty-fourth; ninety-sixth.【解析】题干解析:练习2.用英语表示分数和百分数1/2 _____________ 1/4 ______________3/4 _____________ 2/7 ______________9/10 ____________ 2/5 ______________12% ____________ 98% ____________ 50% ________________ 97.3% ___________ 1% ______________ 8% ________________ 0.8% ____________ 3.5% ____________ 100%_______________ 【答案】One second; one fourth; three fourths;two sevenths; nine tenths; two fifthstwelve percent; ninety eight percent;fifty percent; ninety seven point three percent;one percent; eight percent; (zero) point eight percent;three point five percent; one hundred percent【解析】题干解析:练习3.用英语写出下列词组1. 两个半小时______________2. 第三节课___________3. 第九周___________4. 在十一月五日___________5. 数百名警察____________6. 得了第二十名___________7. 三十五位学生__________ 8. 差一刻三点_____________9. 每日三次_____________10. 在20世纪80年代____________【答案】two hours and a half / two and a half hoursthe third classthe ninth weekon November (the) fifth / on the fifth of Novemberhundreds of policemenbe / get / come in twentieththirty-five students / pupilsa quarter to three / 2:45three times a dayin / during the 1980s / 1980’s【解析】题干解析:短文填空练习1.根据汉语提示完成下面的短文Zhao Ming is a _____1______ (13岁) boy. Yesterday was his ______2______ (13 岁的) birthday. He wanted to have a birthday party. But his father, a driver of______3_____ (40岁), is working in Beijing with his mother. He called Zhao Ming, “Your mother and I are so far from you. We can’t go home for your party. Why not have a party _____4______ (每隔一年)？” Zhao Ming agreed. But his friends remembered his birthday. They went to buy some food and drinks. Zhao Ming’s classmate, Le Feng, bought him a big cake. It was _____5____(几英寸高) and _____6____ (两倍大) a ball. It cost him ______7____ (50元). They also bought Zhao Ming _____8_____ (一个二手的) mobile phone so that he could keep touch with his parents. Zhao Ming was very happy.【答案】thirteen-year-oldthe thirteenthfourty-year-oldEvery yeara few inches talltwice as big asfifty yuana used【解析】题干解析:练习2.完成下面句子的英语翻译1. 开始时我觉得有点难。