內容簡介:1.基、序數詞的定義及常用用法2.常考基、序數詞表基數詞定義:基數詞表示人或物的數量。用法:①表示人或物的數量:百位數和十位數之間或者百位數和個位數之間加and，十位數和個位數之間要用連字符“-”。twobooks兩本書 twenty-oneapples二十一個蘋果threehundredandforty-fivestudents三百四十五個學生②基數詞表示順序、編號時，由“單數名詞+基數詞”構成，此時名詞和基數詞的第一個字母通常大寫。NO.1middleschool第一中學 Class7,Grade6六年級七班 Room203203房間③構成復合形容詞:復合形容詞的構成成分之間要用連字符“-”，并且名詞要用單數形式。atwelve-year-oldboy一個十二歲的男孩④hundred(百)，thousand(千)，million(百萬)，billion(十億)的用法:在表示精確數量時，hundred，thousand等不用復數形式;當與“of+復數名詞”連用時，表示模糊概念，這時hundred，thousand等要用復數形式。twohundred200 hundredsof...數以百計的序數詞定義:序數詞表示人或事物的次序，翻譯成“第......”，通常要與定冠詞the連用。用法:①表示事物的先后順序：常與定冠詞the連用，“the+序數詞”，后面接單數名詞。但當序數詞前面有名詞所有格、物主代詞或指示代詞修飾時，前面不能加the。Septemberistheninthmonthofayear.九月是一年中的第九個月。Today'sfirstclassisEnglish.今天的第一節課是英語。②表達日期:在表達“某月某日”時，“日”要用序數詞。HisbirthdayisonMarch5th.他的生日是三月五日。常考基數詞和序數詞表:數字1-12數字基數詞序數詞簡寫數字基數詞序數詞簡寫1onefirst1st7sevenseventh7th2twosecond2nd8eighteighth8th3threethird3rd9nineninth9th4fourfourth4th10tententh10th5fivefifth5th11eleveneleventh11th6sixsixth6th12twelvetwelfth12th數字13-19數字基數詞序數詞簡寫數字基數詞序數詞簡寫13thirteenthirteenth13th17seventeenseventeenth17th14fourteenfourteenth14th18eighteeneighteenth18th15fifteenfifteenth15th19nineteennineteenth19th16sixteensixteenth16th數字(幾十幾)——以21-29為例數字基數詞序數詞簡寫數字基數詞序數詞簡寫21twenty-onetwenty-first21st26twenty-sixtwenty-sixth26th22twenty-twotwenty-second22nd27twenty-seventwenty-seventh27th23twenty-threetwenty-third23rd28twenty-eighttwenty-eighth28th24twenty-fourtwenty-fourth24th29twenty-ninetwenty-ninth29th25twenty-fivetwenty-fifth25th數字(整十)數字基數詞序數詞√or×數字基數詞序數詞√or×20twentytwentieth20th70seventyseventieth70th30thirtythirtieth30th80eightyeightieth80th40fortyfortieth40th90ninetyninetieth90th50fiftyfiftieth50th100hundredhundredth100th60sixtysixtieth60th注:在寫序數詞時，我們有時會用到縮寫形式。一般習慣于用數字加上這個序數詞的最后兩個字母構成。基數詞變序數詞記憶口訣:基變序，有規律；一二三，特殊記。(first,second,third)結尾各是t,d,d,th要從四加起。八去t，九去e，ty變為tiefive,twelve兩兄弟，要以f代ve。若是遇到幾十幾，只變個位就可以。習題:一、寫出下列單詞的序數詞one_______ _______ eight_______ 8.twelve_______twenty_______ 10.thirty_______ 12.twenty-one_______用所給單詞適當形式填空—What'sthe______(five)monthoftheyear？—It'sMay.Mondayisthe______(two)dayoftheweek.3.Nextweekishis______(twenty)birthday.4.Thisishis______(two)dictionary.5.Teacher'sDayisonSeptember______(ten).6.Ithinkthe______(five)lessonisreallydifficult.7.The______letterin“HAPPY”isA.8.Tomisfourteenyearsoldandtomorro