序数词

一、序数词的定义

表示顺序的数词叫做序数词，是由基数词变化而来的。

二、序数词变化规律

1、2、3，单独记，(one—first,two—cond,three—third)

th要从4加起，

8少t，9去e，(eight—eighth,nine—ninth)

ve用f来代替，(five—fifth,twelve—twelfth)

y用ie来代替，(twenty—twentieth,thirty—thirtieth)

几十几和几百几，只变个位记心里。(twenty-one—twenty-first)

思考：hundred（百）的序数词是什么？

一、写出下列数字的序数词

One—eleven—twenty-one—

Two—twelve—twenty-two—twenty—

Three—thirteen—twenty-three—thirty—

Four—fourteen—twenty-four—forty—

Five—fifteen—twenty-five—fifty—

Six—sixteen—twenty-six—sixty—

Seven—venteen—twenty-ven—venty—

Eight—eighteen—twenty-eight—eighty—

Nine—nineteen—twenty-nine—ninety—

Ten—hundred—

二、扩展

January,February,March,April,May,June,July,September,October,November,

December

masDay(圣诞节)is_________.

’sDay(劳动节)is______.

r’sDay(元旦)is________.

ool’sDay(愚人节)is________.

antingDay(植树节)is____________.

en’sDay(儿童节)is_____

rs’Day(教师节)is___________.