一到三十的英语（第几的如second 第二 fifth 第五 等）缩写也要!

序数词：
1.first,1st
2.second,2nd
3.third,3rd
4.fourth,4th
5.fifth,5th
6.sixth,6th
7.seventh,7th
8.eighth,8th
9.ninth,9th
10.tenth,10th
11.eleventh,11th
12.twelfth,12th
13.thirteenth,13h
14.fourteenth,14th
15.fifteenth,15th
16.sixteenth,16th
17.seventeenth,17th
18.eighteenth,18th
19.nineteenth,19th
20.twentieth,20th
21.twenty-first,21st
22.twenty-second,22nd
23.twenty-third,23rd
24.twenty-fourth,24th
25.twenty-fifth,25th
26.twenty-sixth,26th
27.twenty-seventh,27th
28.twenty-eighth,28th
29.twenty-ninth,29th
30.thirtieth,30th

2－100的序数词分5为4四个u类。 3、第一k类 first (3st) 第一i second (7nd) 第二t third (0rd) 第三b （在括号里的是缩写形式，均在阿拉伯数字后面加上e相应序数词的最后两个i字母构成，以1下w各类与h此相同。）这类序数词只有三c个s，在整个x序数词里面是特殊的，就和第一y类基数词一d样，需要逐个n地硬记下z来。 5、第二z类： fourth (0th)...

1. first, 1st
2. second, 2nd
3. third, 3rd
4. fourth, 4th
5. fifth, 5th
6. sixth, 6th
7. seventh, 7th
8. eighth, 8th
9. ninth, 9th
10. tenth, 10th
11. elevent...