第21,22,23,24,25,26,27,28,29,30,31的英语怎么说答:第21:twenty-first /21st;第22:twenty-second/22nd;第23:twenty-third/23rd;第24:twenty-fourth/24th;第25:twenty-fifth/25th;第26:twenty-sixth/26th;第27:twenty-seventh/27th;第28:twenty-eighth/28th;第29:twenty-ninth/29th;第30:thirtieth/30th;第31:thirty-first/31th。