八年级英语上册Unit2Numbersgrammar.pptx

Unit 2 NumbersGrammarLead-in:answer questions.1 How old are you？Im 13 years old.2 Whats your telephone number?My telephone number is 27227854.3 How many students in your class?How many students in your grade?There are 52 students in my class and about 310 students in our grade.4 In which year were you born?In 1999/2000/2001.以上的数字都是基数词（以上的数字都是基数词（cardinal numbers）.A.Do you know!Cardinal numbers12345678171819201112131415169103040528598onetwothreefourfivesixseveneightnineteneleventwelevethirteenfourteenfifteensixteenseventeeneighteennineteentwentythirtyfortyfifty-twoeighty-fiveninety-eight基数词的构成基数词的构成1）112,独立成词。独立成词。one two three four five six seven eight nine ten eleven twelve2）13-19,由由39+teen构成。构成。14fourteen 16-sixteen 17-seventeen 19nineteen 特殊拼写特殊拼写:13 thirteen 15-fifteen 18eighteen 3）2090,以以-ty结尾。结尾。20twenty 30-thirty 40forty 50fifty 80-eighty 60-sixty 70-seventy 90ninety 4）2199，两位数，十位与个位之间有两位数，十位与个位之间有“”。21 twentyone 55 fiftyfive 99 ninetynine Lets play a game：报数报数Say numbers one by one according to the seat order.按照座位顺序一个接一个报数。报按照座位顺序一个接一个报数。报错数的同学站着，并要在小组得分错数的同学站着，并要在小组得分上扣一分。上扣一分。100375200one hundredtwo hundredthree hundred and seventy-five642958236six hundred and forty-twonine hundred and fifty-eighttwo hundred and thirty-six5）101999，三位数，百位与十位，三位数，百位与十位/个位之间加个位之间加and。101 one hundred and one 840 eight hundred and forty 693 six hundred and ninety-three29,43150076,thousandhundredmillionbillionand6)1，000以上数目以上数目,从右向左每三位用从右向左每三位用“，”分开分开,分别读为分别读为thousand,million,billion 基数词的构成基数词的构成Read the following numbers.2,53425,342253,4232,534,233two thousand five hundred and thirty-fourtwenty-five thousand three hundred and forty-twotwo hundred and fifty-three thousand four hundred and twenty-threetwo million five hundred and thirty-four thousand two hundred and thirty-three534five hundred and thirty-four2,250,342,330two billion two hundred and fifty million three hundred and forty-two thousand three hundred and thirtyA.lets read it.100015，3624,189one thousandfour thousand one hundred and eighty-ninefifteen thousand three hundred and sixty-two100，000285，643one hundred thousandtwo hundred and fifty-eight thousand six hundred and forty-threeA.Cardinal and ordinal numbers1,000,0003,367,982one millionthree million three hundred and sixty-seven thousand nine hundred and eighty-twoWork out the ruleIn the cardinal numbers,we do not add-s to hundred,_ and _.With large numbers,we put _between hundred and ten.thousandmillionand注意：注意：表示具体、准确的数目时，表示具体、准确的数目时，hundred,thousand,million等数词后不能加等数词后不能加-s,如如five hundred,six thousand,seven million等。等。当当hundred,thousand等数词与等数词与of连用，表连用，表示不具体、不准确的数目时，词尾须加示不具体、不准确的数目时，词尾须加-s。如：如：thousands of students,millions of trees.1、“几十几十”的复数形式可以表示：的复数形式可以表示：几十多岁几十多岁-in+ones+数词复数数词复数 年年 代代 -in+the+数词复数数词复数 1)He died in his forties四十多岁四十多岁 2)In the nineties,most people go to work by bike.90年代年代2、“基数词基数词+名词名词”的的合成形容词合成形容词作定语，作定语，中间有连字符中间有连字符“”,当中的名词用当中的名词用单数单数。a 3 year old girl a seven-day holiday 3、表计量、表计量-“基数词基数词+度量单位度量单位+形容词形容词”The classroom is 7 meters long,6 meters wide and 3 meters high.基数词的用法基数词的用法A.Cardinal and ordinal numbers1st2nd3rd4th5th6th7th8th17th18th19th20th11th12th13th14th15th16th9th10th21st33rd40th100thfirstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenthtwentiethtwenty-firstthirty-thirdfortietyhundredth序数词的构成序数词的构成1)13,first,second,third。2)419,相应基数词相应基数词+th,特殊拼写特殊拼写:fifth,eighth,ninth,twelfth。3)2090,y变成变成ie+th,如如twentieth。4)2199,只把个位的基数词变成序数词只把个位的基数词变成序数词 如如twenty-first。5)序数词缩写序数词缩写-数字最后两字母数字最后两字母 如如1st,2nd,3rd,4th基变序基变序,有规律有规律,一、二、三，特殊记，面目全非要注意，一、二、三，特殊记，面目全非要注意，加加th从从4起，起，八少八少“t”，九去，九去“e”，“ve”要用要用“f”替，替，(five,twelve)见见“y”变成变成“i”和和“e”，词尾加上，词尾加上“th”，(twenty,thirty,ninety)若是遇到几十几，只变个位就可以。若是遇到几十几，只变个位就可以。序数词缩写记清楚序数词缩写记清楚,数字后跟两字母。数字后跟两字母。(序数词构成规律)Work out the ruleWe form most ordinal numbers by adding _to the cardinal numbers.There are exceptions,like first,second and third.thPractice makes perfect!1(2)_3412(6)_2328MayAlanDannyJanePeterAliceSteveZoeMay is the(1)_.Alan is the second.Danny is the(3)_.Jane is the(4)_.Peter is the(5)_.Alice is the nineteenth.Seveve is the(7)_.Zoe is the(8)_.firstthirdfourthtwelfthtwenty-thirdtwenty-eighth219序数词前加定冠词序数词前加定冠词the1999 nineteen ninety-nine2008 two thousand and eight19491949年年1010月月1 1日日 读作读作:October(the)first,nineteen forty-nine(月月-日，年日，年)the first of October,nineteen forty-nine（日（日-月，年）月，年）写作写作:October 1st,1999(日用缩写，月日用缩写，月-日日-年年)October 1,1999 (日用数字日用数字)1st October,1999日日-月，年月，年年份、日期表达法年份、日期表达法年年用用基数词基数词表示表示,两位一读两位一读,介词用介词用in日日用用序数词序数词表示表示,介词用介词用on 表示表示“在在世纪世纪”,用序数词。用序数词。在在20世纪世纪 写作：写作：in 20th century 读作：读作：in the twentieth century 常考点，易错点第1单元,第5课 Unit1/the first unit/Lesson Five/the fifth lesson302 号房 Room 3029个生日，第9个生日,我的第9个生日nine parties,the ninth party,my ninth partyMake a dialogue:talk about the birthdaysBetty-2 JanuaryDavid-30 SeptemberCindy-16 JuneAlan-3 MarchJay-22MaySam-12 OctoberA:When is Bettys birthday?B:It is on the second of January/January the second.A:Is Bettys birthday on the the twelfth of January?B:No.Its on the second of January.B.Instruction about numbers3+9 9-33*99/3Add 3 and 9Subtract 3 from 9Multiply 3 by 9Divide 9 by 3 3 plus 9 equals/is 12.9 minus 3 equals/is 6.3 multiplied by 9 equals/is 27.9 divided by 3 equals/is 3.3+9=129-3=63*9=279/3=3add,substract,multiply 和 divide都是动词。plus and minus 都是介词add and add and subtract from subtract from Read the instructions aloud.B.Instruction about numbers1.S1:Add 11 and 1.S2:11 plus 1 equals/is 12.(11+1=12)2.S1:S_5_13 S2:_ m_ _ equals/is_.()3.S1:M_ 7 _8.S2:_m_by _equals/is _.()ubtractfrom13inus5813-5+8ultiplyby7ultiplied8567*8=564.S1:D_16_4.S2:_d_ by_ equals/is_.()5.S1:A_ 9 _6.S2:_p_ _equals/is _.()6.S1:A_ 14 and 4 and d_the answer by 2.S2:_p _ _ and d _the answer by _ equals/is _.()ivideby16ivided4416/4=4ddand9lus6159+6=15ddivid14 lus4ivided29(14+4)/2=9Competition!全班分为两大组，开展加减乘除对抗赛。由A组向B组提问5道题，例如：729=？，B组回答，然后再交换。注意题目不要太难，如果自己都回答不上来，出题人会被扣分。