一到十九、十到二十、三十…直到九十，二十一到二十九基数词变序数词

一到十九、十到二十、三十…直到九十，二十一到二十九基数词变序数词

除前三个数外，其他的大多在结尾加th。二十后先写十位数，在加个位(twenty- first 21st)。One firstTwo secondThree thirdFour fourthFive fifthSix sixthSeven seventhEight eighthNine ninthTen tenthEleven eleventhTwelve twelfthThirteen thirteenthFourteen fourteenthFifteen fifteenthSixteen sixteenthSeventeen seventeenthEighteen eighteenthNineteen nineteenthTwenty twentieth (注意要把y变ie再加th)Twenty-one twenty-firstTwenty-two twenty-secondTwenty-three twenty-thirdTwenty-four twenty-forth…Thirty thirtieth…Forty fortiethFifty fiftiethSixty sixtiethSeventy seventiethEighty eightiethNinety ninetiethOne-hundred One-hundredth 本人愚见，保证正确。如被采纳，万幸直至！