1~20英语序数词

英语序数词1-20是 :

firstsecond thirdfourth fifth

sixth seventh eighth ninthtenth

eleventhtwelfth thirteenthfourteenthfifteenth

sixteenthseventeentheighteenth nineteenth twentieth

first，second ，third，fourth，fifth，sixth，seventh，eighth，ninth，tenth，eleventh，twelth，thirteen，fourteenth，fifteenth，sixteenth，seventeenth，eighteenth，nineteenth，twentieth。