,序数词的含义表示次序的数词叫序数词,是由基数词变化而来的。,序数词的变化,1 one -first 2 two-second 3 three-third 4 其余的序数词都是由基数词后加-th 变化而来的吗?,fifth,整十的序数词把 y 变成 i加-eth,twenty-twentieth,Can you read?,1 thirty-thirtieth 2 forty-fortieth 3 fifty -fiftieth,When is Teachers Day?,Its September10th.,When is National Day?,Its October 1st.,When is Independence Day? 美国独立日 Its_.,July 4th,基数词变序数词歌 基变序,有规律: 词尾加上th(fourth,sixth) 一、二、三,特殊记; 结尾字母t,d,d(first,second,third); 八减t,九去e (eighth,ninth); ve要用f替(fifth,twelfth); ty将y变i;若是碰到几十几, 前用基来后用序。,