1 one2 two3 three4 four5 five6 six7 seven8 eight9 nine10 ten11 eleven12 twelve13 thirteen14 fourteen15 fifteen16 sixteen17 seventeen18 eighteen19 nineteen20 twenty分析：一、1~12 是单个单词，要牢记。二、13~19 都是以-teen结尾，特殊记忆：thirteen , fifteen , eighteen三、凡是符合整拾都是以-ty 结尾：twenty(20) , thirty(30 ) , forty(40 ) , fifty (50), sixty(60), seventy(70 ), eighty (80 ),ninety(90)。特殊记忆：forty, eighty