1到12的序数词用英文怎么说

1到12的序数词用英语分别是：first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth。

序数词的来源是拉丁语，它们都是由基数词（如 one, two, three）加上后缀 -th 构成的。

例句：

I will be back on the first of next month. (我下个月的第一天就会回来。)
The second chapter of the book is about the history of the city. (这本书的第二章讲的是这个城市的历史。)
He came in third in the race. (他在比赛中获得第三名。)
The fourth rule is very important to follow. (第四条规则非常重要需要遵守。)
The fifth note in the song is sharp. (这首歌中的第五个音是高音。)
He passed his sixth grade math exam. (他通过了六年级的数学考试。)
The seventh day of the week is Sunday. (星期天是一周的第七天。)
The eighth month of the year is August. (八月是一年中的第八个月。)
The ninth inning was the last of the game. (第九局是比赛的最后一局。)
The tenth floor is the highest floor in the building. (第十层是这栋建筑物中最高的一层。)
The eleventh hour is the last possible time to finish. (第十一个小时是完成的最后时间。)
The twelfth night is the last night of the hopday. (第十二晚是假期的最后一晚。)