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1、数词数词NumeralNumeralDefinitionDefinition定义定义ClassificationClassification分类分类UseUse用法用法010101010202020203030303定义：表示数目的多少或顺序的先后。数词有两种：基数词 Cardinal numeral，序数词Ordinal numeral1.表示数目的多少叫做基数词。如one,two,three.；one hundred等。2.表示顺序的先后的数词叫做序数词。如first,second,third.,fifteenth等。例句There are five people in my family
2、.我家有五口人。We live on the sixth floor in a tall building.我们住在一座高楼的第六层。)数字的写法和读法:(1)十位与个位之间要加连字符“-”;(2)百位和十位之间要加and;(3)三位数以上的数，从个位往前数，每三位数加一个逗号“，”，从后往前数的第一个逗号代表thousand,第二个逗号代表million,第三个逗号是billion，注意这几个词不能用复。数形式，后也不能加and1.从1-12分别由从one到twelve1 12个各不相同的词表示。如：three,four,seven等。2.从13-19均以后缀-teen结尾。如13 thir
3、teen,15 fifteen,16 sixteen等。3.从20-90的整十数词均以后缀-ty结尾。twenty,thirty,forty,eighty等。基数基数词词4.表示“几十几”时,个位和十位之间需加连字符,如 21 twenty-one,32 thirty-two,43 forty-three等。5.百位和十位之间要加and;如：105 one hundred and five.345 three hundred and forty-five。1.不规则变化特殊:first，second，third.其他:添加“th”。如:第九 ninth,第十二 twelfth,第十九 nine
4、teenth。2.以-ty结尾的表示“几十”的基数词，先把y变为i，再加-eth.如：20 twenty-twentieth，30 thirty-thirtieth。3.表示“第几十几”时，十位数的“几十”仍用基数词，只把个位部分变成序数词就行了。如：第三十一 thirty-first，第五十六 fifty-sixth，第七十三 seventy-third。4.除上述情况外，均在词尾加-th，如:ten tenth，one hundred one hundredth。序数序数词词 Exercises一写出下列单词的序数词一写出下列单词的序数词。1.one 5.twelve 2.two 6.tw
5、enty 3.six 7.thirty-one 4.ten 8.one hundred secondfirsttenthsixthone hundredththirty-firsttwentiethtwelfth二.写出下列单词的基数词1.third 2.first 3.eightieth 4.forty-second 5.twelfth 6.two hundredththreeeightyforty-twotwelvetwo hundredone基数词变序数，-th要在结尾处一二三真特殊，八去t，九去e;f要把 ve替，y换成 ie，结尾别忘-th假如碰到几十几，个位变序就可以。这里填写标题
6、这里填写标题 口诀口诀：巧记基数词变序数1.表示具体、准确的数目时，hundred.thousand,million等数词后不能加-s。如：500 five hundred,6000 six thousand,seven million等。当表示不具体、不准确的数目时，hundred,thousand 等数词与of连用，词尾须加-s。如:thousands of students 成千上万的学生,millions of trees 数百万的树。数词的用法数词的用法2.表示年代世纪时，如：20世纪90年代 in the 1990s/1990s 读法:in the nineteen ninetie
7、s。21世纪 twenty-first century。in ones+整十基数词复数 表示在某人几十岁时。如：在他50多岁时 in his fifties3、“基数词+名词”的合成形容词作定语，中间有连字符“一”,当中的名词用单数如：一个三岁的小女孩 a 3-year-old girl 七天的假期 a seven-day holiday1.Which month of the year do you like best?-July,the _ month,because summer vacation begin in this month.A.seven B.six C.seventh D
8、.sixth答案:C2.There are _months in a year.December is the _month of a year.A.twelve;twelve B.twelfth;twelfth C.twelve;twelfth D.twelfth;twelve答案:C3.-Have you seen the CCTV news on T V?Yes,_children had a good festival on the _childrens Day.A.millions of;sixty B.ten million;sixty C.millions of;sixtieth
9、 D.ten millions;sixtieth答案：CLets do some exercisesLets do some exercises4._sheep were killed in the accident.A.Thousand of B.Thousand C.Thousands of答案：C5.There are over nine _workers in the factory,but _of young people hope to work in it.A.hundred of;hundreds B.hundred;hundreds C.hundreds;hundred答案：
10、B6.-How old is your daughter?-_.We had a special party for her_ birthday last week.A.Ninth;ninth B.Nine;nine C.Ninth;nine D.Nine;ninth 答案：D7.There will be more chances in_ century than in_ century.A.twenty-one,twenty B.twenty-first,twentieth C.the twenty-first,the twentieth答案：C8.The city changed a l
11、ot_.A.in 1980s B.in the 1980s C.in the 1980答案：B9.John is an _boy.A.eight years B.eight-year-old C.eight-years-old答案：B 根据根据句意填基数词或序数词句意填基数词或序数词1.August is the_ month of a year.2.There are_ days in May.3.There are hours in a day.4.March is the _ month of a year.5.There are days in November.thirty-onetwenty-fourthirty thirdeighth