专题二　第2讲　数词

第2讲数词MisterSmithissixty①yearsoldandyesterdaywashis60th②birthday.Hestillremembersinthe1990s③whenhewasinhisthirties③，hedrankdozensof④bottlesofbeeraday.However，hespentthousandsof④dollarsinhospital.Later，twofifths⑤ofhissparetimewasspentintakingexercise.[规则感悟]①数词的基本形式为基数词。②表示数词的顺序往往用序数词。大部分是在基数词的基础上加-th。以-y结尾的基数词变序数词，把-y变成-ie再加-th。③“inthe＋逢十的基数词的复数”表示“在某个世纪几十年代”。“inone’s＋逢十的基数词的复数”表示“在某人几十多岁时”。④具体数字＋dozen/score/hundred/thousand/million等词时，后面直接加名词复数；表示笼统数目时，用dozens/scores/hundreds/thousands/millionsof＋名词复数。⑤分数表达：分子用基数词，分母用序数词。当分子大于1时，分母序数词加-s，如：1/3：onethird,2/3：twothirds。1．易错基数词thirteen十三fourteen十四fifteen十五eighteen十八nineteen十九twenty二十thirty三十forty四十fifty五十ninety九十2．易错序数词first第一second第二third第三fourth第四fifth第五eighth第八ninth第九eleventh第十一twelfth第十二3．序数词的使用(1)序数词在句中主要作定语，一般情况下序数词前要加定冠词。Mondayistheseconddayofaweek.星期一是一周的第二天。(2)序数词前有时加不定冠词，表示“又一、再一”，相当于another。Wouldyoulikeasecondcupoftea?你还想再来一杯茶吗？Ihadafourthapple.我(吃了三个苹果后)又吃了一个苹果。(3)有时序数词作状语，不加冠词。Hecameoutfirstinthecontest.他在比赛中获得第一名。对点练习1．Petergotamodelshipfromhisuncleonhis____________(thirteen)birthday.2．Two____________(three)ofthestudentsinourclasshavebeentoDisneyland.3．Linda，therearetoomanymistakesinthe____________(nine)lineofyourpassage.4．Hemadequiteafewfriendsduringhis_________(twenty)．5．Itisreportedthattheearthquakehasleft________(thousand)ofpeoplehomeless.1．Withouta____________(two)thought，heagreedtojointheclub.2．30%oftheriver__________________________(pollute)bythewaterfromthefactoryalreadyandmanyfishhavedisappeared.3．Then，whenIwasinthe__________(five)grade，IwantedtobeateacherbecauseIlikedmyEnglishteacherverymuch.(2019·全国Ⅱ)