基數(shù)詞 序數(shù)詞

1 one 1st first

2 two 2nd second

3 three 3rd third

4 four 4th fourth

5 five 5th fifth

6 six 6th sixth

7 seven 7th seventh

8 eight 8th eithth

9 nine 9th ninth

10 ten 10th tenth

11 eleven 11th eleventh

12 twelve 12th twelfth

13 thirteen 13th thirteenth

14 fourteen 14th fourteenth

15 fifteen 15th fifteenth

16 sixteen 16th sixteenth

17 seventeen 17th seventeenth

18 eighteen 18th eighteenth

19 nineteen 19th nineteenth。