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

21 twenty-one

22 twenty- two

23 twenty- three

24 twenty- four

25 twenty- five

26 twenty- six

27 twenty- seven

28 twenty- eight

29 twenty- nine

30 thirty

31 thirty- one

32 thirty- two

33 thirty- three

34 thirty- four

35 thirty- five

36 thirty- six

37 thirty- seven

38 thirty- eight

39 thirty- nine

40 forty

41 forty- one

42 forty- two

43 forty- three

44 forty- four

45 forty- five

46 forty- six

47 forty- seven

48 forty- eight

49 forty- nine

50 fifty

51 fifty- one

52 fifty- two

53 fifty- three

54 fifty- four

55 fifty- five

56 fifty- six

57 fifty- seven

58 fifty- eight

59 fifty- nine

60 sixty

61 sixty- one

62 sixty- two

63 sixty- three

64 sixty- four

65 sixty- five

66 sixty- six

67 sixty- seven

68 sixty- eight

69 sixty- nine

70 seventy

71 seventy- one

72 seventy- two

73 seventy- three

74 seventy- four

75 seventy- five

76 seventy- six

77 seventy- seven

78 seventy- eight

79 seventy- nine

80 eighty

81 eighty- one

82 eighty- two

83 eighty- three

84 eighty- four

85 eighty- five

86 eighty- six

87 eighty- seven

88 eighty- eight

89 eighty- nine

90 ninety

91 ninety-one

92 ninety- two

93 ninety- three

94 ninety- four

95 ninety- five

96 ninety- six

97 ninety- seven

98 ninety- eight

99 ninety- nine

100 hundred

first (1st) 第一

second (2nd) 第二

third (3rd) 第三

（在括号里的是缩写形式,均在阿拉伯数字后面加上相应序数词的最后两个字母构成,以下各类与此相同.）这类序数词只有三个,在整个序数词里面是特殊的,就和第一类基数词一样,需要逐个地硬记下来.

2、第二类：

fourth (4th) 第四

fifth (5th) 第五

sixth (6th) 第六

seventh (7th) 第七

eighth (8th) 第八

ninth (9th) 第九

tenth (10th) 第十

eleventh (11th) 第十一

twelfth (12th) 第十二

thirteenth (13th) 第十三

fourteenth (14th) 第十四

fifteenth (15th) 第十五

sixteenth (16th) 第十六

seventeenth (17th) 第十七

eighteenth (18th) 第十八

nineteenth (19th) 第十九

hundredth（100th）第一百

这一类序数词共有十七个.均在相应的基数词后面加上后缀－th构成.要注意其中fifth、eighth、ninth、twelth四个词的拼法.

3、第三类：

twentieth (20th) 第二十

thirtieth (30th) 第三十

fortieth (40th) 第四十

fiftieth (50th) 第五十

sixtieth (60th) 第六十

seventieth (70th) 第七十

eightieth (80th) 第八十

ninetieth (90th) 第九十

这一类全是十位整数的序数词,共八个.它们的构成方法是：先将相应的十位整数的基数词词尾－ty中的y改成i,然后在加上后缀－eth.

4、第四类：

thirty-first (31th) 第三十一

sixty-second (62nd) 第六十二

eighty-seventh (87th) 第八十七

ninety-eighth (98th) 第九十八

ninety-ninth（99th)第九十九

one hundredth（100th）第一百

这类表示“第几十几”的序数词,跟表示“几十几”的基数词一样简单.在构成方法上均由基数词“几十几”变化而来,十位数不变,仅把个位上的基数词变成序数词就行了