一、基數(shu)詞及其主要用法
表(biao)示數目(mu)的(de)詞稱基數詞。15 fifteen，幾百幾千不加s，242 two hundred and forty-two，5058 five thousand and fifty-eight，9，600，000 nine million six hundred thousand
1.基數詞可以用(yong)于數字的計算。
6+8=14 Six plus eight is fourteen.
9-7=2 Nine minus seven is two.
7X5= 35 Seven times five is thirty-five.
8÷4=2 Eight divided by four is two.
2.基數詞可以表示(shi)人(ren)的大致年齡(ling)和年代(dai)。
He died in his fifties.
This took place in 1990s/1990s.
The professor became successful in his thirties.
3.基數詞可以(yi)用來表達年(nian)份、時間、電話號碼。
1700 seventeen hundred
1814 eighteen fourteen
9：20 nine twenty
11：30 eleven thirty/ half past eleven
5：45 five forty-five/ a quarter to six
88760231 eight eight seven， six zero two， three one
4.基(ji)數詞可以用于編號。
Number six， line 4， page 19， Bus(No.) 332， Platform (No.) 5， Room 101
5.基數詞(ci)(ci)可以和其他詞(ci)(ci)一起構(gou)成(cheng)合成(cheng)形容詞(ci)(ci)，在(zai)句子中作定語。
A one-month-old baby can recognize its mother by smell.
This eleven-month-old baby can speak a few words.
(The baby is eleven months old.)
The teacher asked us to write a four-thousand-word essay as our homework.
(There are four thousand words in the essay.)
This four-paragraph essay is too difficult for me to understand.
(There are four paragraphs in this essay. )
二(er)、序數詞及其(qi)主要用法
表示(shi)順序(xu)的詞稱為序(xu)數(shu)詞。如first， second， third， fourth， ninth， twenty-first， forty-fifth等(deng)。
序數詞(ci)可以用來表(biao)示日期和世紀。May the first / the first of May(5.1)， August the eighth / the eighth of August(8.8)， the twentieth century， the twenty-first century
序數詞(ci)在句子中前面一般加the
The first of October is our National Day.
She was the third to arrive.
序數詞在句子中前(qian)面加不定冠詞，表示“再一(yi)”又一(yi)“。
Theyll have to do it a second time.
Shall I ask him a third time?
When he sat down ， a fourth man rose to ask.
三、分數詞的(de)構成(cheng)
分(fen)數(shu)(shu)的分(fen)子(zi)用(yong)基數(shu)(shu)詞表示(shi)，分(fen)母用(yong)序(xu)數(shu)(shu)詞表示(shi)，若分(fen)子(zi)大(da)于1，分(fen)母需用(yong)復數(shu)(shu)。
two-thirds(2/3)，one-third(1/3)， nine-tenths (9/10)， five-twelfths(5/12)。
特(te)殊(shu)表達法有：one half (1/2)，a quarter (1/4)， three quarters (3/4)
考試重(zhong)點
基數詞可以和其他詞一起構成合成形(xing)容詞，在句子(zi)中作定語，名(ming)詞不能加s.
數詞(ci)部分需特(te)別注(zhu)意dozen， hundred， million， billion 等(deng)詞(ci)。表(biao)示具體(ti)數字(zi)時，這(zhe)些詞(ci)用(yong)單數形式，表(biao)示不具體(ti)的數字(zi)時，須用(yong)dozens of， hundreds of 這(zhe)類的結(jie)構(gou)。
I want three dozen of these.
He has been there dozens of times.
It is reported that _____ people in this area were saved in the storm.
A. hundred B. hundred of C. hundreds of D. some hundreds
(答案 C)
當(dang)數(shu)詞與名(ming)詞及其他詞構成(cheng)合成(cheng)形(xing)容詞時，合成(cheng)形(xing)容詞中(zhong)間若用(yong)連字符，則其中(zhong)的(de)名(ming)詞須(xu)用(yong)單數(shu)形(xing)式。
The homework for the next period is to write a two-hundred-word composition about your hometown.
Mary is a eleven-year-old girl.
(Mary is eleven years old.)
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