Vocabulary and speaking.ppt

外研版
高一年级(必修1)
Module 5
Module 5
Vocabulary and speaking
英语中基数词、序数词、分数、小数和百分数的读法
1. 基数词的读法:
A. 先“几十”, 再“几”,中间用连字符。
. 23—
89—
B. 先“几百”, 再加and,再加末两位。
. 223—
416—
809—
twenty-three
eighty-nine
two hundred and twenty-three
four hundred and sixteen
eight hundred and nine
C. 1000以上的数从后向前数,每三位数加“,”;第一个“,”号前为thousand; 第二个“,”号前为million; 第三个“,”号前为billion。
. 1,001—
9,743—
750,000,000—
one thousand and one
nine thousand, seven hundred and forty-three
seven hundred and fifty
million
2. 序数词的读法
序数词一般以与之相应的基数词加-th构成,如:tenth(第十),但下面这些基数词在变序数词时, 有特别的地方。
A. one — two —
three— five—
eight — nine—
twelve—
first
second
third
fifth
eighth
ninth
twelfth
B. 以-ty结尾的词,先变-y为-i,再加-eth。
. twenty— forty—
C. 以one, two, three, five, nine收尾的多位数词,要照第一条方法变。
. twenty-one—
twenty-two —
y-nine—
a hundred and fifty-three —
twentieth
fortieth
twenty-first
twenty-second
y-ninth
a hundred
and fifty-third
基数词表示分子,序数词表示分母,分子大于1时,序数词要用复数。
. 1 / 4 —
2 / 3—
7 / 9—
5 / 12—
one-fourth
two-thirds
seven-ninths
five-twelfths
3. 分数词的读法
特殊的表达法
½—
¼—
¾—
a / one half
a / one quarter
three quarters
4. 小数的读法
—
—
—
seven point eight
zero point one two five
fourteen point three nine seven