数 词

基数词变序 数词的规则

去e再加th nine→ ninth 末尾有t只加h eight→ eighth 将ve改为f后再加th five→ fifth, twelve→ twelfth

特殊变化 one→ first, two→ second, three→ third

逢十的基数词，ty→ieth twenty→ twentieth, thirty→ thirtieth, forty→ fortieth, fifty→ fiftieth

几十几的基数词只变后面一个基数词 thirty-five→ thirty-fifth, ninety-eight→ ninety-eighth