内容正文:
数词
➽数词的概念:
表示数目多少或者顺序先后的词叫数词。
➽数词的分类:
1.表示数目多少的叫基数词;如:one一,two二,three三,four四。
2.表示顺序先后的词叫序数词。如:first第一,second第二,third第三。
➽基数词
1、 基数词的构成:
1. 1-12形各异
1
2
3
4
5
6
7
8
9
10
11
12
one
two
three
four
five
six
seven
eight
nine
ten
eleven
twelve
2. 13-19结尾均是“teen”
13
14
15
16
17
18
19
thirteen
fourteen
fifteen
sixteen
seventeen
eighteen
nineteen
3. 20-90整十数结尾均是“ty”
20
30
40
50
60
70
80
90
twenty
thirty
forty
fifty
sixty
seventy
eighty
ninety
4. 21-99在整十位的数词后加上个位的数词,中间加上连字符“-”
21
32
45
67
89
twenty-one
thirty-two
forty-five
sixty-seven
eighty-nine
5. 101-999的构成要在百位数与十位数之间加and
158
one hundred and fifty-eight
369
three hundred and sixty-nine
457
four hundred and fifty-seven
743
seven hundred and forty-three
999
nine hundred and ninety-nine
6. 1000以上的数字,从后向前数,每三位数加一“,”;
第一个“,”前为thousand(千),第二个“,”前为million(百万)……。
1,002
one thousand and two
12,300
twelve thousand and three hundred
378,456
three hundred and seventy-eight thousand four hundred and fifty-six
6,569,782
six million five hundred and sixty-nine thousand seven hundred and eighty-two
37,389,146
thirty-seven million three hundred and eighty-nine thousand one hundred and forty-six
2、 基数词的用法:(有数字无s)
1. 前有基数词时,hundred、thousand、million后不加s
如:There are seven hundred students in our school.在我们学校有七百个学生。
2. hundreds of成百上千的、thousands of成千上万的
如:There are thousands of trees on the farm.农场里有成千上万的树。
➽序数词
一、序数词的构成:
1.123特殊记
第一
first
1st
第二
second
2nd
第三
third
3rd
2.4-19由相应的基数词+th构成,但注意有特殊变化(fifth,eighth,ninth,twelfth)
第四
第五
第六
第七
第八
第九
第十
第十一
第十二
fourth
fifth
sixth
seventh
eighth
ninth
tenth
eleventh
twelfth
4th
5th
6th
7th
8th
9th
10th
11th
12th
3.20-90整十数,变y为ie,+th
第二十
第四十
第五十
第六十
第九十
twentieth
fortieth
fiftieth
sixtieth
ninetieth
20th
40th
50th
60th
90th
4.要是遇到第几十几的序数词时,只有个位数用序数词
第三十一
第四十二
第五十三
第六十五
第八十八
第九十九
thirty-first
forty-second
fifty-third
sixty-fifth
eighty-eighth
ninety-ninth