表示次序的数词叫序数词，是由基数词变化而来的。 •1 one -----first •2 two------second •3 three----third 其余的序数词是由基数词后加-th 变化而来。 几个特殊变化的序数词 •1 five----fifth •2 twelve----twelfth •3 eight----eighth •4 nine----ninth 整十的序数词把 y 变成 i加-eth •1 twenty----twentieth •2 thirty----thirtieth •3 forty----fortieth •4 fifty -----fiftieth •5 你能写出 sixty seventy eighty ninety 的序数词吗？ 你对了吗？ •1. Sixty----sixtieth •2. seventy---seventieth •3.eighty----eightieth •4,ninety----ninetieth 几十几的序数词，十位数不变，个位数变成序数词。 •••1. twenty-one 21----twenty-first 21st 2.thirty-two 32-----thirty-second 32nd 3.ninety-nine 99----ninety-ninth 99th •4 .请写出66 83 48 55的序数词。 日期的表达 date What’s the date today? It’s March 28th. Einstein 1-10 one two three four five six seven eight nine ten 11-20 eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty 21-29 twenty-one twenty-two twenty-three twenty-four.... 30-39 thirty thirty-one thirty-two .... 40-49 forty forty-one forty-two forty-three.... 50-59 fifty fifty-one fifty-two fifty-three..... 60-69 sixty sixty-one sixty-two sixty-three..... 70-79 seventy seventy-one seventy-two ..... 80-89 eighty eighty-one eighty-two eighty-three.... 90-99 ninety ninety-one ninety-two ninety-three... 100 one hundred 本文来源：https://www.wddqw.com/doc/1a97762e2af90242a895e598.html