1到30的序数词为:
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 14th=fourteenth 15th=fifteenth 16th=sixteenth。
17th=seventeenth 18th=eighteenth 19th=nineteenth 20th=twentieth。
21st=twenty-first 22nd=twenty-second 23rd=twenty-third 24th=twenty-fourth。
25th=twenty-fifth 26th=twenty-sixth 27th=twenty-seventh 28th=twenty-eighth。
29th=twenty-ninth 30th=thirtieth。
扩展资料:
序数词的用法
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。
2、当表达分数时,序数词前不用the。
3、当表达“又一,再一”时,序数词前不用the,但可加不定冠词。
4、当表达“年月日”时,序数词前不用the。
5、当序数词在句中作状语时,序数词前不用the。
6、当表达考试(赛跑等)中获得的名次时,序数词前不用the。
7、示某人的多少岁生日时,序数词前不加the。
参考资料来源:百度百科-序数词