特殊形式外,其他的在基数词后面加th 构成。如:four→fourth, thirteen→thirteenthР整十的数字的序数词构成方法是:先将十位数词尾的y变成i再加eth, 如:thirty→thirtieth, forty→ fortiethР将几十几变成序数词时,只把个位数变成序数词,十位数不变,如:thirty-six→thirty-sixthР序数词的缩写形式是由阿拉伯数字加上序数词的最后两个字母构成的,如:first→1st, second→2nd,third→3rd,sixth→6th,Рtwenty-first→21st Р节日Holiday(首字母大写)Р春节Spring Festival / Chinese New Year---in January or February Р元旦New Year--- January 1stР妇女节Women’s Day—March 8thР植树节Tree-planting Day--- March 12th Р愚人节April Fool’s Day--- April 1stР劳动节Labor Day--- May 1stР母亲节Mother’s Day—the second Sunday of May五月第二个周日Р儿童节Children’s Day—- June 1stР父亲节Father’s Day -– the third Sunday of June六月第三个周日Р教师节Teacher’s Day -- September 10th Р国庆节National Day—October 1stР万圣节Halloween—October 31stР感恩节Thanksgiving—the fourth Thursday of November十一月第四个周四Р圣诞节Christmas—December 25th