数词
1、基数词：表示数目多少。
1 | one | 11 | eleven | 21 | twenty-one |
2 | two | 12 | twelve | 22 | twenty-two |
3 | three | 13 | thirteen | 30 | thirty |
4 | four | 14 | fourteen | 40 | forty |
5 | five | 15 | fifteen | 50 | fifty |
6 | six | 16 | sixteen | 60 | sixty |
7 | seven | 17 | seventeen | 70 | seventy |
8 | eight | 18 | eighteen | 80 | eighty |
9 | nine | 19 | nineteen | 90 | ninety |
10 | ten | 20 | twenty | 100 | hundred |
注意：数字“0”可以读作“zero”，也可以读作字母“o”。
2、序数词：表示顺序先后。
1st | first | 11th | eleventh | 21st | twenty-first |
2nd | second | 12th | twelfth | 22nd | twenty-second |
3rd | third | 13th | thirteenth | 30th | thirtieth |
4th | fourth | 14th | fourteenth | 40th | fortieth |
5th | fifth | 15th | fifteenth | 50th | fiftieth |
6th | sixth | 16th | sixteenth | 60th | sixtieth |
7th | seventh | 17th | seventeenth | 70th | seventieth |
8th | eighth | 18th | eighteenth | 80th | eightieth |
9th | ninth | 19th | nineteenth | 90th | ninetieth |
10th | tenth | 20th | twentieth | 100th | hundredth |
基数词变序数词记忆口诀：
一、二、三，需要记，八去t，九省e，ve结尾时，f来代替，
ty结尾时，y变ie，再加th，若是几十几，前基后序别忘记。
