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4.( ) _______ of the college student in the college work during the summer holidays.

   A.  A half  B.  Half   C.  Quarter   D.  Three quarter

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3.( ) My father began to learn Japanese when he was ______.

A. in his fourties  B. in his forties  C. in him fortieth  D. in his fourty

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2.( ) TV was one of the greatest inventions in the _______ century.

A. nineteenth   B. twenty   C. twentieth   D. twentith

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(1)Hundred, thousand和million前面有具体数词 (包括数量词several) 都不能加-s, 但可以加-s和of连用,表示几百, 几千, 几百万人或物。如:three thousand people 三千人;thousands of  people 几千人或成千上万个人

(2)一般年份分两个基数词念,如:

1999年-nineteen ninety-nine

但2000年-the year two thousand

2008年-two thousand and eight

公元前450-four hundred fifty B.C.

(3)几月几日有两种念法

  1 September念the first of September

  Match 8th 念March the eighth

(4)时刻表示法有两种

  1)用past 表示几点过几分。(过半用to, 表示几点差几分)整点的o’clock可省去,分钟如是五的倍数, minutes可省去;15分钟可用a quarter;30分钟可用half。如:a quarter past one; twenty to six; two minutes to two; half past six

2)分别念钟点和分钟(o’clock, minute 不必念)

3:25 (读作 three twenty-five )

(5)表示一次用once;两次用twice;三次开始用基数词+times表示。如:

    Three times;  ten times

第三节 巩固练习

I  选择填空

1.(   )  -How much is 2/3 _____ 1/2?

-1/3.

A. plus   B. divided by   C. times   D. minus

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例1
-This is      second book I’ve read today.
-Are you going to read      third one?
 
A.
a,a
B.
a,the
C.
the,a
D.
the,the
答案:
C
提示:
序数词前面一般要加the,但在不强调次序,只表达“重复”的概念时,second,third等序数词前面只要加不定冠词。这时他们的含义是“另一”,“再一”。
例2
There are six      students in our school.
 
A.
hundreds
B.
hundreds of
C.
hundred
D.
hundred of
答案:
C
提示:
hundred一词表示百,后面不能加s,如one hundred,two hundred。如果hundred后面加s,则要与of连用,写成hundreds of表示“数以百计的、成百上千的”。
例3
10月1 El的正确读法是      
 
A.
October the first
B.
October No. one
C.
October one
D.
October first one
答案:
A
提示:
对月日的读法英语中月用固定单词,日用序数词与定冠词the连用
例4
      of them have passed the exam.
 
A.
Three quarter
B.
Three quarters
答案:
B
提示:
在英语中分数词是以基数词和序数词合成的,基数词代表分子,序数词代表分母,除了分子是“l”的情况外,序数词都要用复数。例如:one-third,two-thirds。

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类别
说明
例词或例句
分数
分子用基数词,分母用序数词,分子大于1,分母的序数词用复数。
1/2 读作 a (one) half
1/3 读作 a (one) third
1/4  读作a (one) quarter; a (one) fourth
4/5  读作four fifths
4 2/3 读作four and two thirds
Two thirds of the surface earth is covered by water.
小数
小数点读作point。小数后面各数都按个位基数词读;小数点前面仍按基数词读。零读作o/  u/或zero.
0.7 读作zero ( u) point seven
25.25 读作twenty-five point two five
百分比
百分比由基数词+percent组成 ( % )
2% 读作two percent
44%  读作forty-four percent
100%  读作one hundred percent
More than 25 percent of the surface of the ground is covered with grass. 百分之二十五的地面被草复盖着。
倍数
(1)   倍数+as+形(副)原级+as
(2)   倍数+形(副)比较级+than
(3)   倍数+ the size(length)+ of (表示大小或数量的名词)
as large as
This room is three times larger than that one.
the size of
注意:上述三个结构的意义是相同的。
汉译表达:
“这间房是那间房的三倍大”;“这间房比那间房大两倍”
加、减、乘、除四则运算
用基数词表示
加号用plus / and
减号用minus
乘号用times
除号用divided by
9+8=17, 读作 Nine plus (and) eight is seventeen.
11-5=6 , 读作 Eleven minus five is six.
6×5=30, 读作 Six times five is thirty.
35÷7=5, 读作 Thirty-five divided by seven is five.

第二节 实战演练

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(三)使用序数词的情况

   (1)第几

(2)月份后的号 (August 5th)

(3)事物表示顺序 (名词在后,如:the fiftieth page; the Second World War)

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(二)使用基数词的情况

   (1)念数 (o 念作 /o /或 zero)

(2)电话号码(62083338)

(3)事物表示顺序 (名词在前,如:Room 303; World War Two)

(4)货币 (100 dollars)

(5)度量 (50 kilos)

(6)小数 (2.5 meters)

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(一)数词的词形

   (1)在1-12中,1-12为基数词中的数词;序数词1-3为特殊变化,序数词4-12在基数词词尾加-th。[注意 fifth (第五);ninth (第九)和 twelfth (第十二)的特殊拼写]

(2)在13-19中,13-19基数词在数词3-9后加-teen构成。其中13 和15 发生拼写变化 thirteen 和 fifteen 相应序数词在基数词后加-th构成。13-19岁的少年用teens (in one’s teens在某人十多岁时)

(3)在20-90整十位数,在基数词2-9之后加-ty构成。其中20、30、40、50拼法特殊。在构成相应的序数词时,将词尾y变i,再加-eth。表示二十多岁等用twenty 等的复数twenties. (in one’s twenties 在某人二十多岁时)

(4)十位数之间的数,由十位数加个位数构成,中间用连字符。构成序数词时,连字符前为基数词,后为序数词。如:二十五 twenty-five; 第九十九 ninety-ninth.

(5)100以上数词,整百位数由1-9加 hundred构成,序数词在词尾加-th;整千位数由1-9加thousand构成,序数词在词尾加-th.在百位和十位,个位间(没有十位时,在百位和个位须加and),如:141 one hundred and forty-one;1001 one thousand two hundred and one 构成序数词只将最后一个数变成序数词。

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8.     ago, before

 (1)___liberation my family lived a poor life.

She went to America three days ___.

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