七年级英语数词知识点讲解七年级英语数词知识点讲解知识点总结数词分为基数词和序数词两种;(一)基数词在英语中表示数目的词称为基数词1.基数词的构成(1)1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty(2)21-99 先说“几十”,再说“几”,中间加连字符23→twenty-three,34→thirty-four,(3)101—999先说“几百”,再加and,再加末两位数或末位数;586→five hundred and eighty-six,803→eight hundred and three(4)l,000以上,先从右往左数,每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion,然后一节一节地表示9,785→nine thousand, seven hundred and eighty-five6,260,309→six million two hundred and sixty thousand three hundred and nine750,000,000,000→seven hundred and fifty, billion2.基数词的用法(1)表示数量Eg. 一 How many books would you like?一I would like two.(2)表示号码eg.My phone number is 6887789.(3)表示时间eg.I watch CCTV News at seven o’clock every evening.(4)表示“…十”的数词的复数可以表示人的岁数或年代。
eg. He is in his early thirties.他有三十来岁(31—34岁):This took place in the 1930s.这事发生在二十世纪三十年代;(5)表具体数字时,hundred,thousand,million用单数eg. There are six hundred students in our grade.(6)表不确定的数字时,数词用复数若带名词,再加of ,hundreds of(数百,成百上千 的),thousands of(数干,成千上万的),millions of(数百万)eg Hundreds of old people died of cold last winter.(二)序数词在英语中表示顺序、次序的词称为序数词1.序数词的构成(1)一般在基数词后加th, eg.four→fourth,thirteen→thirteenth,多位数把个位变序数词基数词变为序数词的规则(口诀):基变序,有规律,词尾加上 th;一、二、三特殊记,结尾t、d、d八减t,九减e,f要把ve替ty把y改为i,记得th前有个e2.序数词的用法(1.)the+序数词,表示“第几”John lives on the fifteenth floor(2).a\an+序数词,表达"再一,又一"eg.Well have to do it a second time.(3)年月日的表达年用基数词表示,日用序数词表示(4)分数的表达分子用基数词,分母用序数词。
分子大于1,分母加-s5)序数词也可以用作副词,When did you first see him?(6)基数词也能表示顺序,如书刊的页的数目,住所、房间、教室、号码等等Page Eight, Room 304,Class Seven,(7).倍数表示法主语+谓语+倍数(或分数)+ as + adj. + as I have three times as many as you.我有你三倍那么多8)在…世纪:in the twenty-first century常见考法对于数词的考查,通常是以单项选择、词语运用或听力形式考查学生在具体语言环境中灵活运用数词的能力误区提醒1.在具体语境中正确使用序数词,并能正确书写序数词2.在听力中听辨数字和号码,要速记且准确3. hundreds of,thousands of,millions of表示约数时的用法典型例题1:In _____,Mr.Li began to learnEnglish.A.his 1990 B. the 1990s C the 1990 D a 1990解析:从题意中可判断出要表达时间,如果是____年,那么直接就是in 1990就可以了, C和D排除掉,人是不可能有1990岁的,排除A,B表达的是“十八世纪 九十年代”。
答案:B典型例题2: September is _________(九) month of the year.解析:这是一道填空题,考查序数词的拼写序数词前加the, 故用the ninth.。