牛津7B-Unit1-语法-序数词用法

Unit1DreamhomesGrammar序数词Learningaims:1.Gettoknowthespellingsandusagesoftheordinalnumbers.2.Useordinalnumberscorrectlytotalkaboutdates,floorsandorders.Review

定义：谈论日期，楼层，位置等。序数词:表示顺序的数词叫序数词1stfirst

2ndsecond

3rdthird4thfourth5th

fifth6thsixth7thseventh8theighth9th

ninth10thtenth11theleventh12th

twelfth13ththirteenth14thfourteenth15thfifteenth16thsixteenth17thseventeenth18theighteenth19thnineteenth20thtwentieth21sttwenty-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth27thtwenty-seventh28thtwenty-eighth29thtwenty-ninth30ththirtieth31stthirty-firstLearnthesenumbersandfindouttherules:基数词变序数词表示顺序的数词叫序数词。基数词变序数词的规那么是：〔1〕大局部数词在词尾加th：如:fourth〔第四〕thirteenth〔第十三〕hundredth〔第一百〕〔2〕表示整十的基数词，变ty为tie，再加th;如：twentieth第二十eightieth第八十〔3〕特殊的序数词有:第一first,第二second，第三third，第五fifth,第八eighth,第九ninth，第十二twelfth(4)要把一个“几十几〞，“几百几〞的基数词变成序数词，只需把个位数变成序数词。如:32thirty-second256twohundredandfifty-sixth(5)在表示编号的东西时，可以用基数词表示，也可用序数词表示如:thefirstlesson=LessonOnethesixthgrade=GradeSix

1st

first

2nd

second3rdthird5thfifth8theighth12thtwelfth9thninth基数词变序数词口诀一、二、三，单独记；八去t，九除e，ve要用f替，整十基数变序数，先把ty变成tie；要是遇到两位数，十位基数个位序，th最后加上去。

序数词的用法：1.序数词前一般要加定冠词the。如：Thefirstboyismybrother.

2.表示分数时，基数词作分子，序数词作分母，当分子大于1时，分母要用复数。如：1/4onefourth;2/5twofifths1.Elsalivesonthe______floor.2.Ivanlivesonthe_______floor.3.Marylivesonthe______floor.4.Peterlivesonthe______floor.5.Rickylivesonthe_____floor.6.Wilsonlivesonthe______floor.seventhfifteenthfourthsecondninthtwelfthCompleteB2onPage12.1.Doyouliveonthe_____(nine)floor?2.NextFridayismyfather’s_______(forty)birthday.3.Wewillhavethe____(five)lessonnextweek.CompletesentenceswiththecorrectformsofthewordsDosomeexercisesgiven.Exerciseninthfortiethfifth4.Thereareeight________(hundred)studentsinourschool._________ofthemcomefromthesametown.5.O