4.( ) _______ of the college student in the college work during the summer holidays.
A. A half B. Half C. Quarter D. Three quarter
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
2.( ) TV was one of the greatest inventions in the _______ century.
A. nineteenth B. twenty C. twentieth D. twentith
(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
例1 |
-This is second book I’ve read today. -Are you going to read third one? |
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|
A. |
a,a |
B. |
a,the |
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C. |
the,a |
D. |
the,the |
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答案: |
C |
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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”。 |
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例2 |
There are six students in our school. |
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|
A. |
hundreds |
B. |
hundreds of |
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C. |
hundred |
D. |
hundred of |
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答案: |
C |
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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”。 |
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例3 |
10月1 El的正确读法是 |
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|
A. |
October the first |
B. |
October No. one |
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C. |
October one |
D. |
October first one |
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答案: |
A |
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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 |
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例4 |
of them have passed
the exam. |
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|
A. |
Three quarter |
B. |
Three quarters |
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答案: |
B |
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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
(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)
(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)
(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。
8. ago, before
(1)___liberation my family lived a poor life.
She went to America three days ___.
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