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八年級英語數(shù)詞講解例題解析
在我們平凡的學(xué)生生涯里，是不是經(jīng)常追著老師要英語數(shù)詞知識點？英語數(shù)詞知識點就是學(xué)習(xí)英語的重點。想要一份整理好的英語數(shù)詞知識點嗎？下面是小編幫大家整理的八年級英語數(shù)詞講解例題解析知識點，僅供參考，大家一起來看看吧。
八年級英語數(shù)詞講解例題解析知識點 1
數(shù) 詞
英語數(shù)詞表示數(shù)目或者順序， 可分為基數(shù)詞和序數(shù)詞�；鶖�(shù)詞表示數(shù)量，序數(shù)詞表示順序。
知識梳理：提綱挈領(lǐng)，抓住重點和難點!
一、基數(shù)詞的構(gòu)成
1.1-12的基數(shù)詞是獨立的單詞，即： one，two，three，four，five，six，seven，eight， nine，ten，eleven，twelve。
2.13-19的基數(shù)詞以-teen結(jié)尾。如： fourteen，seventeen等，但13，15，18較特殊， 13-thirteen 15-fifteen 18-eighteen。
3.20-90的整十位均以-ty結(jié)尾。如： sixty，ninety，但20，30，40，50，80較特殊， 20-twenty 30-thirty 40-forty 50-fifty 80-eighty。
4.十位數(shù)與個位數(shù)之間要加連字符號"-"，如：28-twenty-eight，96-ninety-six。
5.百位和十位(若無十位則和個位)之間加and，如：148-one hundred and forty-eight 406-four hundred and six。
6.hundred(百)，thousand(千)，million(百萬)，billion(十億)等前面即使有具體的數(shù)詞，也不能在它們的后面加s。如：600-six hundred，8百萬-eight million。
7.1000以上的數(shù)字，從后往前數(shù)每三位加一個逗號"，"第一個逗號前為千(thousand)，第二個逗號前為百萬(million)，第三個逗號前為billion(十億)。英語中無"萬"這個詞，我們可以用"幾十個千(thousand)"表示幾萬，"幾百個千(thousand)"表示"幾十萬"。如：2，510=two thousand five hundred and ten;84，296=eight-four thousand two hundred and ninety-six;274，350=two hundred and seventy-four thousand three hundred and fifty。
二、序數(shù)詞的構(gòu)成
序數(shù)詞一般是以與之相應(yīng)的基數(shù)詞尾加-th構(gòu)成，例如 fourth, tenth,但以下的這些基數(shù)詞變?yōu)樾驍?shù)詞時， 有特別之處。
1.one--- first, two --- second, three --- third, five --- fifth, nice --- ninth, twelve --- twelfth
2. 以ty 結(jié)尾的單詞， 要先變y為I, 在加-eth. 例如：thirty ---thirtieth, fifty ---fiftieth
3. 以one, two, three 等結(jié)尾的多位數(shù)詞， 要將各位數(shù)變成序數(shù)詞。 例如： twenty-one --- twenty-first, one hundred and one --- one hundred and first
注意： 序數(shù)詞前常用定冠詞， 有時還可以用不定冠詞 a/an 則表示 "又一 "的意思。
例如：Mr Brown has a second car. 布朗先生另外還有一輛車。
He has tried a second time. 他又嘗試了一次。
三、數(shù)詞的應(yīng)用
1.時刻的.表示：小時、點鐘、分鐘、秒鐘要用基數(shù)詞。
�、�"幾點鐘"用基數(shù)詞加o'clock。o'clock可省略。如： 5點鐘-five(o'clock).
�、�"幾點過幾分 "，≤30分鐘"用介詞past。如： 7：05-five past seven;7：15-fifteen (a quarter)past seven;7：30-half past seven。
�、�"差幾分幾點"用介詞"to"。如：7：40-twenty to eight;7：45-fifteen(a quarter to eight。
�、苋粘Ｉ钪械臅r間讀法常常簡化，直接按基數(shù)詞的順序讀。如：7：05-seven o five;7：15- seven fifteen。
2.年月日的表示：
�、� 年份用基數(shù)詞，如：1999年-nineteen ninety-nine; 1900年-nineteen hundred; 2000-two thousand;1905-nineteen o five;
�、� 年用基數(shù)詞，日用序數(shù)詞。如：1998年6月8日 寫作：June 8，1998;讀作：June the eighth， nineteen ninety-eight或the eighth of June， nineteen ninety-eight。
3. 世紀、年代表示法：
(在)90年代 (in) the nineties
(在)19世紀 (in) the nineteenth century
(在)18世紀30年代 (in) 1730s或1730's
4.編號的表示：
① Lesson One =the first lesson第一課;
�、� Bus No.3=the No.3bus 3路公共汽車;
�、� 表示住所時不用"No."如：302房間-Room 302(讀作：room three o two);
�、� 如果編號的數(shù)詞比較長，一般用基數(shù)詞。如：Page 457第457頁;
�、� 電話號碼，用基數(shù)詞,如：3855633-three eight five five(double five) six three three(double three)。
5.分數(shù)的表達：
分子用基數(shù)詞，分母用序數(shù)詞，分子大于"1"，分母則加"s"。如：1/3 one third，2/3two thirds;
另外：1/2 a(one)half; 1/4one fourth或a(one)quarter;3/4threefourths或three quarters。
half a second; a quarter of a second四分之一秒
6. 表示有小數(shù)的詞用基數(shù)詞。
5.5 five point five
12.135 twelve point one three five
7.表示百分數(shù)
5℅：five percent (per cent)， 0.8℅ zero point eight percent (per cent).
8.表示有小數(shù)的詞用基數(shù)詞。
5.5 five point five
12.135 twelve point one three five
9.其他用法：
1)基數(shù)詞+單數(shù)名詞+形容詞構(gòu)成合成形容詞。如：一個五歲的男孩a five-year-old boy;
一座800米長的橋an 800-metre-long bridge;女子400米接力girls'400-metre relay race。
2)具體數(shù)詞+metre(s)/kilometre(s)/kilo(s)long / high /tall /deep /away等。如：長江長6300公里。The Changjiang River is 6，300 kilometres long.
3)表示"幾十歲"用序數(shù)詞，eg. 在他三十幾歲時 in his thirties
4)倍數(shù)的表達：(一倍用once，兩倍用 twice，兩倍以上用基數(shù)詞+times。如：5倍five times)。
例如：He is as tall a boy as I.
He is a head taller than I .
He is two years older than I
China is four times as large as Europe.
I am twice as old as you. (=I am twice older than you. /I am twice the age of you.)
My books are twice as many as yours.
China is four times larger than Europe.(=China is four times the size of Europe.)
I pay twice as much as it was worth.
I pay twice as much for the house.
例題解析：舉一反三，學(xué)的更輕松!
1. _______ Chinese are looking for ways to learn English well before Beijing 2008 Olympic.
A. Thousand B. Thousands C. Thousand of D. Thousands of
2. Both of the rules are broken. I want to buy a ______ one.
A. three B. third C. forth D. /
3). --- Which is the smallest number of the four? --- _________.
A. Two- thirds B. A half C. A quarter D. Three-fourths
4). Please write down the new words in the text of _______.
A. Lesson Eleven B. the Lesson Eleven C. Lesson Eleventh
解析：1.基數(shù)詞hundred, thousand, million, billion 等前有具體數(shù)字時，它們后面不能加s,若這些詞后面有介詞of (幾百，成百上千) ，thousands of (幾千，數(shù)千個)，millions of, billions of 前不可用數(shù)詞修飾。但可用many, some, several 等修飾。故選答案D.
2.答案： B。此題主要考查序數(shù)詞的運用。
3.答案：C。此題主要考查英語中的分數(shù)表示法。英語中表示分數(shù)時，分母用序數(shù)詞，分子用基數(shù)詞，當分子大于1時，表示分母的序數(shù)詞后要加s.
4.答案： A。 此題主要考查基數(shù)詞的編號。在通常情況下，名詞編號有這幾種表示法：
1）事物名詞+基數(shù)詞，且每個單詞的首字母都要大寫。如：Lesson Eleven;
2）定冠詞+基數(shù)詞+事物名詞。如： No. 6 Middle School
練習(xí)與鞏固：熟能生巧，取得好成績!
選擇填空：
1. _______ of people in the world are sending information by E-mail ever day.
A. Many million B. Several million C. Several millions D. Many millions
2. About _______ of the surface of the earth _______ covered with water.
A. three quarter, is B. three quarters, has C. three quarters, is D. three quarter, are
3. It will take _______ time to finish the work.
A. one and a half year's B. a year and half C. one and a half year's D. a year and half's
4.--- How long will your stay here ?
---For ________ .
A. one and two day's B. one and two day C. a day or two D. one or two day
5.When he moved to Germany in ______ , he was already in _______ .
A. the fifties; his sixties B. fifties; his sixties
C. the fifties; his sixty D. fifty; sixty
6.My brother lives in ______ on ______ floor.
A. six Room ;second B. Room six ;the second
C. Room six; two floor D. the room six ; the second
7.December is _______ month of the year.
A. twelve B. twelfth C. the twelfth D. the twelve
8.This took place in the ______ .
A. 1940 B. 1940s C. 1940es D. 1940th
9.It is only _____ from my home to the train station.
A. ten minutes walk B. ten-minutes walk C. ten minutes 's walk D. ten minutes' walk
10.There are ______ in this building , I live on ______.
A. nine floors ,the ninth floor B. nine floor, the ninth floor
C. nine floor , nine floors D.ninth floor,the ninth floor
11.The water behind the Three Gorges Dams (三峽大壩) should be ______ higher than downstream( 下游)。
A. sixty-five meter B. sixty-fifth meter
C. sixty-five meters D. sixty-fifth meters
12. There are _______ days in a year.
A. three hundred sixty-five B. three hundred and sixty-five
C. three hundred and sixty -five D. two hundreds and sixty-five
13. ---How many teachers are there in your school?
--- __________. , but I'm not sure.
A. Hundreds B. Hundred C. Hundreds of D. One hundred
14. There are _________ doctors and nurses working hard in that hospital.
A. thousand B. two thousand C. two thousands D. two thousands of
15. --- What's one fourth and a half, do you know?
--- Yes, it's _________.
A. two sixths B. three fourths C. one three D. three sixth
16. Now children, turn to page ________ and look at the _______ picture in Lesson Two.
A. twentieth, one B. twenty, one C. twentieth, first D. twenty, first
17. Both of the two rulers are broken. I want to buy a _______ one.
A. three B. third C. forth D. /
18. December is the __________ month in year.
A. twenty B. twelve C. twentieth D. twelfth
19. --- What is the date today?
--- It's _________.
A. Thursday B. June the sixteenth C. the best day D. June fifteen
20. She knows a lot about China as she has been to China ________.
A. for the forth time B. four times C. a fourth time D. for four times
1-5 CCACA 6-10 BCBD 11-15 CCCDA 16 -20 DBDBB
八年級英語數(shù)詞講解例題解析知識點 2
1.數(shù)詞的種類數(shù)詞分基數(shù)詞和序數(shù)詞
基數(shù)詞是表示自然數(shù)列的詞,例如;one,two,three,four…..
序數(shù)詞是表示先后順序的詞,例如:first,second,third,fourth…
2.基數(shù)詞和序數(shù)詞的表示法
(1).基數(shù)詞單詞的拼寫：1~12為單詞，13~19都以后綴-teen結(jié)尾，20至90這樣的`整十數(shù)都以后綴-ty結(jié)尾，其他基數(shù)詞中間加連字符號“-”再按照上述的變化進行。
例：21→twenty-one56--fifty-six85→eighty-five
三位數(shù)的構(gòu)成為：幾+百+and+末兩位(或末一位)數(shù)
例：132→onehundredandthirty-two
205→twohundredandfive
千以上的數(shù)字的讀法：從后面往前，每三位數(shù)作為一個單位，分別為thousand,million.
32,548,652,讀作：thirtytwomillion,fivehundredandfortyeightthousand,sixhundredandfiftytwo
(2.)序數(shù)詞=基數(shù)詞+th(1、2、3為first,second,third)。但以下情況要注意：
1)fifth(第五)，eighth(第八)，ninth(第九)，twelfth(第十二)
2)以ty結(jié)尾的基數(shù)詞變詞尾為tieth
例：twenty→twentieth,ninety→ninetieth
3)復(fù)合序數(shù)詞只需要將相應(yīng)基數(shù)詞中最后一位變成序數(shù)詞，其余不變。
例：第二十一→twenty-first
第二百四十五→twohundredandforty-fifth
基數(shù)詞序數(shù)詞的用法
1.hundred,thousand,million與數(shù)字連用，表示一定量的具體數(shù)字，不用復(fù)數(shù)，但表示不定概念可用復(fù)數(shù)
例：threehundredpeople,millionsofpeople
2.基數(shù)詞表示時刻。五年級英語語法知識點
例：7點seveno'clock,7:20seventwenty
3.給某些事物編號
例：LessonOne=thefirstlesson
BusNo.2 7月1日=JulyI(JulyIst)
1996年6月3日=June3,1996=Junethethird,nineteenninety-six
4.有關(guān)分數(shù)表示法。分子是基數(shù)詞，分母是序數(shù)詞。當分子大于1時，分母就用復(fù)數(shù)。
例：I'vereadone-fifthofthebooks.
I'vefinishedthree-fifthsofthewords.
八年級英語數(shù)詞講解例題解析知識點 3
知識要點
表示“多少”和“第幾”的詞，叫數(shù)詞。數(shù)詞分為基數(shù)詞和序數(shù)詞兩種。
基數(shù)詞：在十位數(shù)詞和個位數(shù)詞中間加上連字符 “ - “ 。如： 21 twenty -one'基數(shù)詞三位以上的數(shù)詞， 在百位和十位之間，一般要用連詞"and “。 如： 132 one hundred and thirty-two.
表示”萬“的詞英語中沒有。如1萬可用10千來表示。 ten thousand. 30萬可用 three hundred thousand 來表示。
基數(shù)詞的用法：
1.編號的事物用基數(shù)詞： 如：Lesson Five， Room 101
2.表示”年，月，日“ 時用基數(shù)詞。
3.表示 “幾點鐘， 幾點過幾分” 用基數(shù)詞。 It is two to two. 現(xiàn)在是兩點差兩分。
4.加減乘除用基數(shù)詞。 One plus two is three.一加二等于三。Eight minus four is four. 八減四等于四。
Two times two is four.二乘二等于四.Ten divided by two is five.十除二等于五。
5表示百分數(shù)用基數(shù)詞.
Thirty percent of them is water. 它們當中有30%的.水。
6.表示分數(shù)時，分子數(shù)字用基數(shù)詞， 但分母要用序數(shù)詞， 如分子不是1，序數(shù)詞要用復(fù)數(shù)形式。
One-fifth of the books are mine. 三分之一的書是我的。
Three-tenths of water is disappeared. 十分之三的水不見了。
2)序數(shù)詞：表示數(shù)目順序的詞用序數(shù)詞。
1.序數(shù)詞1━19 除第一，第二，第三，第五，第八，第九， 第十二變化不規(guī)則外， 其余均由在基數(shù)詞后加上 -th。
2.十位整數(shù)的序數(shù)詞的構(gòu)成方法是， 是將十位整數(shù)基數(shù)詞的詞尾 -y 變成 i 再加 -eth。
3.幾十幾的序數(shù)詞，只是把個位數(shù)變成序數(shù)詞， 十位數(shù)不變。
4.第一百以上的多位序數(shù)詞 由基數(shù)詞的形式變結(jié)尾部分為序數(shù)詞形式來表示。
one hundred and twenty-first ，one thousand，three hundred and twentieth
5.序數(shù)詞的縮寫形式 有時，序數(shù)詞可以用縮寫形式來表示。主要縮寫形式有。
first--lst second--2nd third--3rd fourth--4th sixth--6th twentieth--20th twenty-third--23rd 其中l(wèi)st，2nd，3rd為特殊形式，其它的都是阿拉伯數(shù)字后加上th。
6.通常前面要加定冠詞 the;但是如果序數(shù)詞前出現(xiàn)不定冠詞a或an時，則表示“再”，“又”.
We've tried it three times.Must we try it a fourth time?
7.基數(shù)詞也可以表示順序。只需將基數(shù)詞放在它所修飾的名詞之后(名詞需大寫) 即可，不需要添加定冠詞。
the first lesson-Lesson One ，the fifth page-Page 5， the twenty-first room-Room 21
練習(xí)
1. I've read ______ sports news about the F1 race today.
A. two B. pieces C. two pieces D. two pieces of
2. During World War II， a Jewish(猶太)lady was protected by a local family in Shanghai in her ______.
A. fifties B. fifty C. fiftieth D. the fiftieth
3. The river through our city， which is about _________， is clean again.
A. 6000 meters long B. 6000-metres-long
C. 6000-metre-long D. 6000 meter long
4. I study in Yu Cai Middle School. There are two ____students in our school.
A. thousand B. thousands C. thousand of D. thousands of
5. They said they would have holiday.
A. a two-month B. two months C. two-months D. two-month's
6.-When was the PLA founded?
-It was founded on ____.
A. July 1. 1921 B. October 1.1949
C. May 1.1922 D. August 1.1927
7. In the past two years， many tall buildings have been built in our city. The tallest is an that stands in the centre.
A. 80-floor building B. 60-floor building
C. 80-floor buildings D. 70 floors building
8.The number of people invited ____ fifty， but a number of them _____absent for different reasons.
A. were ; was B. was ; was C. was ; were D. were ; were
9.- How soon will you finish your work? -In about _______.
A. one and a half month B. one month and a half
C. one and half a month D. a month and half
10.-Would you like some fruit， madam? -Oh， yes. _______， please.
A. 5 kilo bananas B. 5 kilos of bananas
C. 5 kilo of bananas D. 5 kilos of banana
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