1、基数词：描述事物数量的多少的词例如：one two three four five six.序数词：描述顺序的词例如：first（第一的）second(第二的).定义：表示顺序的词叫做序数词。即表示第一、第二、第三等的词。1-19 基数词变序数词规则：特殊形式：one-first第一,two-second第二,three-third第三,five-fifth第五,eight-eighth第八，nine-ninth第九,twelve-twelfth第十二 其他的序数词都是在对应的基数词后面加th:four-fourth,six-sixth,seven-seventh,ten-tenth,elev
2、en-eleventh thirteen-thirteenth,fourteen-fourteenth,sixteen-sixteenth,seventeen-seventeenth,eighteen-eighteenth nineteen-nineteenth整十变y为ie再加thtwenty-twentieth,thirty-thirtieth几十几的基数词变序数词，只变个位就可以：twenty-one-twenty-firstfirst-1st second-2ndthird-3rd fourth-4thfifth-5th sixth-6th1月1日:January 1st3月8日:Ma
3、rch 8th6月3日:June 3rd7月6日:July 6th12月25日:December 25th 或者 Dec.25th例如：in 2020 在2020年;in July在七月;in summer在夏天 on Jan.1st在1月1日;on Monday在周一；at 8:00 在八点钟;at noon在中午;at night在夜晚When is Chinas National Day?Its on October 1st.When is the sports meet?Its on April 4th.1.-_is the sports meet?-Its on May 4th.A.When B.Where C.What2.My birthday is _ December 28th.A.on B.in C.at3.January is the _ month of the year.A.one B.first C.second4.Mothers Day is _May.A.on B.in C.at5.I have _pencils.A.tenth B.ninth C.tenTHANK YOU欢迎各位老师指导
