数词 (Numeral)
数词是表示"多少"和"第几"的词。根据功能的不同，数词分为基数词和序数词。
基数词 (Cardinal Numeral)
基数词
表示数量。
100 以下的基本基数词
1:
one
2:
two
3:
three
4:
four
5:
five
6:
six
7:
seven
8:
eight
9:
nine
10:
ten
11:
eleven
12:
twelve
13:
thirteen
14:
fourteen
15:
fifteen
16:
sixteen
17:
seventeen
18:
eighteen
19:
nineteen
20:
twenty
30:
thirty
40:
forty
50:
fifty
60:
sixty
70:
seventy
80:
eighty
90:
ninety
21:
twenty-one
22:
twenty-two
55:
fifty-five
99:
ninety-nine
说明
13-19 以 -teen 结尾，包含两个重音。特别注意
thirteen
fifteen
eighteen
的发音和拼写。
20-90 的十位数整数以 -ty 结尾。
十位数和个位数之间用连字号 "-" 连接。
100 以上的基本基数词
100:
hundred
1,000:
thousand
1,000,000:
million
100,000,000:
hundred million
（一亿）
1,000 million (或
billion
):
ten billion
（十亿）
499:
four hundred and ninety-nine
3,876:
three thousand eight hundred and seventy-six
57,453:
fifty-seven thousand four hundred and fifty-three
768,921:
seven hundred sixty-eight thousand nine hundred and twenty-one
8,641,457:
eight million six hundred forty-one thousand four hundred and fifty-seven
50,000,000:
fifty million
500,000,000:
five hundred million
5,000,000,000:
five billion
50,000,000,000:
fifty billion
说明
100 和 100 以上的基数词使用 hundred, thousand, million, billion 等。
十位数与百位数之间常用 and，但有时也省略，如 850 可以读作
eight hundred fifty
基数词的用法
主语
Two plus nine is eleven.
Four times six is twenty-four.
Three of them went to college last year.
宾语
Give me two.
定语
There are nineteen students in our class.
My uncle bought two hand tractors recently.
表语
She is just fourteen.
He was already forty when he began to learn English.
序数词 (Ordinal Numeral)
序数词
表示顺序。
1-99 的基本序数词
1st:
first
2nd:
second
3rd:
third
4th:
fourth
5th:
fifth
6th:
sixth
7th:
seventh
8th:
eighth
9th:
ninth
10th:
tenth
11th:
eleventh
12th:
twelfth
13th:
thirteenth
19th:
nineteenth
20th:
twentieth
40th:
fortieth
51st:
fifty-first
62nd:
sixty-second
83rd:
eighty-third
94th:
ninety-fourth
说明
1-19 的序数词中，
first
second
third
有特殊形式，其余以基数词加 -th 构成。
fifth
eighth
ninth
twelfth
的拼法不规则。
十位整数的序数词在基数词词尾 -ty 的 y 改成 i 后加 -eth。
基数词“几十几”变成序数词时，仅将个位数变为序数词，如
twenty-one
变为
twenty-first
序数词的缩写形式：1st, 2nd, 3rd, 4th, 31st, 82nd, 93rd, 94th。
序数词的用法
主语
The first is better than the second.
宾语
He was among the first to arrive.
定语
China exploded its first atom bomb in October 1964.
His father died in the Second World War.
表语
Jack is always the first to get to the office in the morning.
：序数词前常用定冠词
the
分数 (Fraction) 和 小数 (Decimal)
分数
1/2:
one half
1/3:
one-third
2/3:
two-thirds
1/4:
one-fourth
或
one quarter
3/4:
three-fourths
或
three quarters
2 3/5:
two and three-fifths
小数
0.5:
zero point five
1.25:
one point two five
3.458:
three point four five eight
时间的表示
所有的时间可以用“小时+分钟”直接读：
6:10:
six ten
8:30:
eight thirty
2:40:
two forty