初中英语语法课件专题四数词.pptx

1、专题四数词一、基数词一、基数词数字数字基数词形式基数词形式例词例词012各自独立各自独立zero 0;one 1;nine 9;twelve 12131939+重读重读teen结尾结尾特殊特殊:thirteen 13;fifteen 15;eighteen 18一般一般:fourteen 14;sixteen 162090整十整十位数位数以以ty结尾结尾twenty 20;thirty 30;forty 40;fifty 50;sixty 60;seventy 70;eighty 80;ninety 90两位数两位数(几几十几十几)整十位数整十位数-个位数个位数twenty-one 21;th

2、irty-five 35;ninety-eight 98数字数字基数词形式基数词形式例词例词三位数三位数(几百几百几几).hundredand+两位数两位数seven hundred and eighty-five 785;two hundred and ten 210多位数多位数从右向左数起从右向左数起,每隔每隔三位数加一个逗号三位数加一个逗号,依次为依次为thousand(千千),million(百万百万),billion(十亿十亿),逗号中逗号中间三位数间三位数76,832,154,968seventy-six billion eight hundred and thirty-two m

3、illion one hundred and fifty-four thousand nine hundred and sixty-eight【温馨提示温馨提示】基数词修饰基数词修饰hundred,thousand,million,billion,dozen等等词时词时,这些词要用单数形式这些词要用单数形式;若与介词若与介词of搭配构成短语表示不确定的数搭配构成短语表示不确定的数目时目时,这些词要用复数形式。例如这些词要用复数形式。例如:two hundred students二百名学生二百名学生three thousand sheep三千只羊三千只羊hundreds of dollars几百

4、美元几百美元millions of workers数百万工人数百万工人【即学活用即学活用】1._(million)of girls took part in the Happy Girl Competition but only few of them succeeded.2.It is reported that over eight_(thousand)people lost their lives in the earthquake in Nepal this year.答案答案:1.Millions2.thousand二、序数词二、序数词数字数字序数词变化规则序数词变化规则例词例词1、

5、2、3不规则变化不规则变化first第一第一;second第二第二;third第三第三419基数词词尾加基数词词尾加th一般一般:fourth第四第四;nineteenth第第十九十九特殊特殊:fifth第五第五;eighth第八第八;ninth第九第九;twelfth第十二第十二20、3090y变为变为ie再加再加thtwentytwentieth第二十第二十ninetyninetieth第九十第九十两位数或两位数或多位数多位数(整整十、百十、百除外除外)只变个位数只变个位数(hundred,thousand等只在词等只在词尾加尾加th)twenty-third第二十三第二十三;one hu

6、ndred and fifty-ninth第一百五第一百五十九十九;hundredth第一百第一百【巧学妙记巧学妙记】基数词变序数词规律基数词变序数词规律基变序基变序,有规律有规律,末尾加上末尾加上-th。一、二、三特殊记一、二、三特殊记,面目全非要注意。面目全非要注意。八加八加th,九去九去e,ve要用要用f替。替。逢十改逢十改y为为ie,后跟后跟-th莫忘记。莫忘记。若想表示几十几若想表示几十几,只变个位就可以。只变个位就可以。【即学活用即学活用】1.The _(two)biggest earthquakes in Nepal have killed more than 8,000 peo

7、ple.2.This is the _(three)time that I come to Paris.I have been here twice.Me too.The world is so large that I want to see more of it.3.Rose received a letter full of love from her parents on her _(sixteen)birthday.4.Do you know where Mr Smiths office is?Its on the_(five)floor of the tall building a

8、cross the street.5.Have you ever come to Weishan Lake before?No.This is my_(one)visit to Weishan Lake.答案答案:1.second2.third3.sixteenth4.fifth5.first三、数词的应用三、数词的应用名称名称表达法表达法例词例词年份日年份日期期月月,日日,年年(日用序数日用序数,年用基年用基数数)特别提示特别提示:年份的读法可先年份的读法可先读前两位数读前两位数,再读后两位数再读后两位数,读日时要加读日时要加the1997年年3月月21日日March the twenty-

9、first,nineteen ninety-seven日日,月月,年年(the+序数词序数词+of+月月,年年)2007年年3月月21日日the twenty-first of March,two thousand and seven名称名称表达法表达法例词例词年年代代in+the+数词的复数形式数词的复数形式在在18世纪世纪20年代年代in the 1720s/1720s读作读作:in the seventeen twenties时时刻刻时在前时在前,分在后分在后,按基数词读按基数词读10:15 ten fifteen分在分在前前,时在时在后后“几点过几分几点过几分”用用past,分钟数须小

10、于半小时分钟数须小于半小时(包括半小时在内包括半小时在内)7:05 five past seven7:15 fifteen past seven7:30 half past seven“几点差几分几点差几分”,用介词用介词to,但分钟数须在半小但分钟数须在半小时以内时以内(不包括半小时不包括半小时在内在内)7:57 three to eight11:46 fourteen to twelve2:40 twenty to three几刻几刻钟钟一刻钟一刻钟:a quarter三刻钟三刻钟:three quarters名称名称表达法表达法例词例词编号编号编号时编号时,序号在前用序数词序号在前用序数

11、词,序号在后用基数词序号在后用基数词lesson twelve=the twelfth lesson名称名称表达法表达法例词例词分数分数记忆口诀记忆口诀:分子基分子基,分母序分母序,分子分子大于大于1,分母加分母加s特别提示特别提示:通常用通常用a/one half表表示。示。用用a/one quarter表示表示 one third two thirds four fifths seven tenths带分数带分数:当分数前面带有整数时当分数前面带有整数时,要用连词要用连词and连接连接2 two and two thirds121314234571023名称名称表达法表达法例词例词倍数倍数

12、英语用英语用twice表示两倍表示两倍,两倍以两倍以上用基数词加上用基数词加times表示表示twice两倍两倍three times三倍三倍forty times四十倍四十倍【即学活用即学活用】1.The number of the students in his school is about eight_(hundred).And two_(three)of them are boys.2.So far,three_(quarter)of the students in our class have seen the film.3.She began to play table tennis in the 1970s,and became famous in her _(twenty).4.Boys and girls,please turn to Page_(five)and look at the _(five)picture.5.Whats the date today?Its April the_(twelve),2016.答案答案:1.hundred;thirds2.quarters3.twenties4.five;fifth5.twelfth