1 first，
2 second，
3 third，
4 fourth，
5 fifth，
6 sixth，
7 seventh，
8 eighth，
9 ninth，
10 tenth，
11 eleventh，
12 twelfth，
13 thirteenth，
14 fourteenth，
15 fifteenth，
16 sixteenth，
17 seventeenth，
18 eighteenth，
19 nineteenth，
20 twentieth，
21 twenty-first，
22 twenty-second，
23 twenty-third，
24 twenty-fourth
25 twenty-fifth
26 twenty-sixth
27 twenty-seventh
28 twenty-eighth
29 twenty-ninth
30 thirtieth，
31 thirty-first
32 thirty-second
33 thirty-third
34 thirty-fourth
35 thirty-fifth
36 thirty-sixth
37 thirty-seventh
38 thirty-eighth
39 thirty-ninth
40 fortieth，
41 forty-first
42 forty-second
43 forty-third
44 forty-fourth
45 forty-fifth
46 forty-sixth
47 forty-seventh
48 forty-eighth
49 forty-ninth
50 fiftieth，
51 fifty-first
52 fifty-second
53 fifty-third
54 fifty-fourth
55 fifty-fifth
56 fifty-sixth
57 fifty-seventh
58 fifty-eighth
59 fifty-ninth
60 sixtieth，
61 sixty-first
62 sixty-second
63 sixty-third
64 sixty-fourth
65 sixty-fifth
66 sixty-sixth
67 sixty-seventh
68 sixty-eighth
69 sixty-ninth
70 seventieth，
71 seventy-first
72 seventy-second
73 seventy-third
74 seventy-fourth
75 seventy-fifth
76 seventy-sixth
77 seventy-seventh
78 seventy-eighth
79 seventy-ninth
80 eightieth，
81 eighty-first
82 eighty-second
83 eighty-third
84 eighty-fourth
85 eighty-fifth
86 eighty-sixth
87 eighty-seventh
88 eighty-eighth
89 eighty-ninth
90 ninetieth，
91 ninety-first
92 ninety-second
93 ninety-third
94 ninety-fourth
95 ninety-fifth
96 ninety-sixth
97 ninety-seventh
98 ninety-eighth
99 ninety-ninth
100 hundredth
绝对正确
第一百以上的多位序数词
由基数词的形式变结尾部分为序数词形式来表示。
one hundred and twenty-first 第一百二十一
one thousand，three hundred and twentieth 第一千三百二十
时序数词前不用the
在英语中，使用序数词时前面要加定冠词 the，但是，在下面的情况下则不加the：
1．当序数词前有形容词性物主代词或名词所有格修饰时，序数词前不用the。 Mother was my first teacher in my life.妈妈是我生命中的第一个老师。
Tom is Lily's third boyfriend. 汤姆是莉莉的第三个男朋友。
2．当表达分数时，序数词前不用the。
One fifth of the students here are from the country. 这儿1/5的学生来自农村。 Three fourths of the students here are from the country. 这儿的3/4的学生来自农村。
3．当表达“又一，再一”时 ，序数词前不用 the，但可加不定冠词。
Please give me a second chance. 请再给我一次机会。
The poor woman had a third baby. 那个可怜的妇女又生了一个宝宝。
4．当表达“年月日”时，尤其在朗读时，序数词前要加the；但当书写时，序数词前不用the。
He was born on June 6th, 1974. 他出生在1974年6月6日。
5．当序数词在句中作状语时，序数词前不用 the。
Who got there second? 谁第二个到那儿的？
I finished the work first. 我最先完成那项工作。
6. 当表达考试（赛跑等）中获得的名次时，序数词前不用 the。
She stands first in her class. 她在班上成绩排名第一。
7．当用在一些习语中， 序数词前不用 the。
Business first and pleasure afterwards. 先做事而后娱乐。
First come, first served. 捷足先登/先到者优先。
at first sight 乍一看到
first and last 总计，一共
first of all 首先
over。。。。。。
有些特殊的一定要分清
