unit4 grammar 数词

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1、Unit4Time1Grammar:数词（numerals）一基数词（CardinalNumber)：用来表示数量的词。zeroonetwothreefourfivesixseveneightnineteneleventwelve2.13---19(--teen):thirteenfourteenfifteensixteenseventeeneighteennineteen10---1223整十20,30,40….90(---ty)twentythirtyfortyfiftysixtyseventyeightyninety4几十几：（21—99）21twenty-one53fifty-thre

2、e59fifty-nine99ninety-nine5百hundred千thousand百万million十亿billion1）表示确指时不加s:一打dozen二十score3a)五千名学生fivethousandstudentsb)六百棵树sixhundredtreesc)四百万张书桌fourmilliondesks2)表示不确定数目时，需要加复数并且与of连用：数百hundredsof数千thousandsof数百万millionsof数十亿billionsof+n.(pl.)许多的dozensof/scoresof4a)数十亿星星billionsofstarsb)数千名老师thousan

3、dsofteachersc)数百万的人millionsofpeopled)几百名学生hundredsofstudents二序数词（OrdinalNumbers）表示顺序的词。Note：序数词可以由基数词便变来。e.g.six–sixthseven-seventh基数词变序数词的规律：5基变序，有规律。结尾加上-th。一，二，三，特殊记，结尾字母t,t,d。（one-first;two-second;three-third)八减t,九去e,(eight–eighth,nine-ninth)6f要把-ve替。（five-fifth）-ty把–y变成i,记住-th前有个e。（twenty–twent

4、ieth）若是遇到几十几，只变个位就可以。（forty-six–forty-sixth）7Practice:1)firstsecondthirdfiftheighthninthtwelfthtwentiethninety-third2)a)…firstinthematch.b)…thetwelfthfloor.c)…asecondtime.d)Thefirsttwopagesare…..81eight2twelve3fifteen4twenty-eight5forty-six6fifty-three7onehundredandsix8onethousandthreehundredandeigh

5、ty-nineTheSecondPeriodTextbook(Page30)Ex.1Theanswers:9Ex.2Theanswers:1first2second4sixth3fifth7twelfth8eightieth5eighth9forty-third10twohundredandthirty-ninth6eleventh10三基数词和序数词的几点应用：1编号既可以用基数词，也可以用序数词2)202房间3）9:454)九月七日1）第五课LessonFivetheFifthLessonRoom202nineforty-fiveSeptember7th112inone’s+整十复数某人几

6、十几岁e.g.他五十几岁获得成功。Hegotsuccesses_________________.inhisfifties年代，朝代，用“inthe+基数词加s或’s”表示“…世纪…年代”e.g.在二十世纪八十年代inthe1980s=inthe1980’s124序数词前加the表示“第…..”;序数词前加a/an，表示“再一，又一…”e.g.我第一次在这里。e.g.Ihavebeenhere_______________________.2)再试一次。Tryit____________________.asecondtimeforthefirsttime135数词-名词-形容词构成形容词的用

7、法：1）Thelittlegirlwrotea______lettertoherfathertotalkabouthersubjects.A2-thousand-wordB2-thousand-wordsC2thousandwordsD2thousandswordsA2)Yesterday,Isawaman__________.A2.20meterstallB2.20–meter-tallC2.2