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fourteenth 14th
fifteen 15 the fifteenth 15th
sixteen 16 the sixteenth 16th
seventeen 17 the seventeenth 17th
eighteen 18 the eighteenth 18th
nineteen 19 the nineteenth 19th
twenty 20 the twentieth 20th
twenty-one 21 the twenty-first 21st
thirty 30 the thirtieth 30th
forty 40 the fortieth 40th
fifty 50 the fiftieth 50th
sixty 60 the sixtieth 60th
seventy 70 the seventieth 70th
eighty 80 the eightieth 80th
ninety 90 the ninetieth 90th
a(one) hundred 100 the hundredth 100th
a(one) thousand 1000 the thousandth 1000th
a(one) million 1 000 000 the millionth 1 000 000th
a(one) billion 1 000 000 000 the billionth 1 000 000 000th
1) 基数词的表达法：
① 1～12的基数词是独立的单词。
② 13～19的基数词均以-teen结尾，注意thirteen, fifteen, eighteen的拼写。
③ 20～90的整十位数均以-ty结尾，注意twenty, thirty, forty, fifty的拼写。
④ 几十几的基数词是由十位数词和个位数词合成，中间加连字符“－”。例如：
21: twenty-one; 32: thirty-two
⑤ 三位数的构成：几＋百＋and＋末位数。例如：
102: one hundred and two 654: six hundred and fifty-four
⑥ 千以上的数字的读法：从后往前，每三位数一个单位。例如：
3762: three thousand seven hundred and sixty-two
98733: ninety-eight thousand seven hundred thirty-three
高分突破：
① 基数词可以和名词构成合成形容词，但名词要用单数。例如：
a 7-year-old girl 一个七岁大的小女孩
② “几十”的数词的复数形式可以表示人的岁数或年代。例如：
in his forties 在他四十多岁时
in the 1940s 在二十世纪四十年代
③ 数词hundred, thousand, million, billion等前无修饰词时，须用复数且后常接介词of，如有many，some，several，a few等修饰词时，可用复数或单数形式，但复数时常有介词of，例如：
three hundred kids
hundreds of kids
many thousand kids = many thousands of kids
2) 序数词的表达法：
序数词＝基数词＋th（第1,第2,第3为first, second, third）,但要注意：
① fifth, eighth, ninth, twelfth的拼写。
② 以ty结尾的基数词变词尾为tie再加th。
③ 几十几以上的基数词变序数词时只有个位数变为序数词。
2 数词的应用：
1) 表示时钟，例如：seven o’clock, eight fifty
2) 表示编号，例如：
Unit One = the first unit
Bus 107 = the number 107 bus
3) 表示年月，例如：
July 27, 2005
4) 分数的表达法：
分子用基数词，分母用序数词。当分子大于1时，分母用复数，例如：
1/3: one third 4/5: four fifths
高分突破：
1/2: one second = a/one half
1/4: one fourth = a/one quarter
3/4: three fourths = three quarters
5) 倍数的表达法：
两倍用twice，三倍以上用基数词＋times表示，常见句型如下：
① ...times + as...as... 例如：
This bag of bananas is twice as heavy as that one.
② ...times + 比较级 + than... 例如：
My ruler is three times longer than yours.
③ ...times the size(height, length, weight) of ... 例如：
This tree is twice the height of that one.
[强化训练]
I.单项选择
1. _______________? Today is March 8th, the Teachers’ Day.
A. What day is it today?
B. Is it Teachers’ Day today?
C. What’s the date today?
D. When is Teachers’ Day?
2. _______ year were you born?
A. When B. What C. Where D. What time
3. What kind of movie do you like?
I like _________________.
A. action movie and comedy B. action movies and comedies
C. action movies and comedy D. action movie and comedies
4. I’m very _______ because there’s an _______ football match on TV tonight.
A. excited, exciting B. exciting, exciting
C. exciting, excited D. excited, excited
5. How many _____ are there in one year?
Twelve.
A. years B. days C. months D. weeks
6. We’ll have a party _____ his birthday.
A. in B. as C. on D. at
7. _____ the same reason, I like Jackie best.
A. Because
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