positive: 1,first 2,second 3, third 4,forth 5,fifth 6,sixth 7,seventh 8,eighth 9,ninth 10,tenth 11,eleventh 12,twelveth后面的就是数字加th<br>一般基数词变序数词都是加th,只有几个是特别的
negative: 1:one [wʌn];2:two [tuː];3:three [θriː];4:four [fɔː];5:five [faɪv];6:six [sɪks];7:seven ['sev(ə);8:eight [eɪt];9:nine [naɪn];10:ten [ten];11:eleven [ɪ'lev(ə)n];12:twelve [twelv];13:thirteen [θɜː'tiːn; 'θɜːtiːn];14:fourteen [fɔː'tiːn; 'fɔːtiːn];15:fifteen [fɪf'tiːn; 'fɪftiːn];16:sixteen [sɪks'tiːn; 'sɪkstiːn];17:seventeen [sev(ə)n'tiːn; 'sev(ə)ntiːn];18:eighteen [eɪ'tiːn; 'eɪtiːn];19:nineteen [naɪn'tiːn; 'naɪntiːn];20:twenty ['twentɪ]。