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1、双曲线的参数方程、抛物线的参数方程•baoxy)MBA双曲线的参数方程双曲线的参数方程•baoxy)MBA⑵双曲线的参数方程可以由方程与三角恒等式相比较而得到，所以双曲线的参数方程的实质是三角代换.说明：⑴这里参数叫做双曲线的离心角与直线OM的倾斜角不同.设,则所以,MAOB的面积为由此可见,平行四边形MAOB的面积恒为定值,与点M在双曲线上的位置无关.3、抛物线的参数方程xyoM(x,y)()c预习思考题型1抛物线参数方程的理解栏目链接变式训练题型2抛物线参数方程的应用栏目链接变式训练变式训练栏目链接目链接Questiontagsunit3反意
2、疑问句结构：陈述句+附加疑问句↓否↓肯否肯附加疑问句的构成：助动词Be动词情态动词＋代词Hecannotswim,__________?Hedoesn’tlikesports,___________?Thereisaradioonthetable,________?Theyhavetoliveearly,_________?Theyhadapartylastnight,________?Weneedtogothere,__________?Youneedn’tgothere,____________?Thisisveryimportant,___
3、__________?Everyoneknowshisjob,____________?canhedoesheisn’ttheredon’ttheydidn’ttheydon’tweneedyouisn’titdoesn’the/don’ttheyPostaletterforme,________?Don’tdothatagain,_______?Let’shaveabreak,________?Letusgohomenow,_______?祈使句肯定的祈使句后加上willyou/would’tyou构成反意疑问句否定的祈使句后加上willyou
4、构成反意疑问句Let引导的祈使句有两种情况：1)Let's...,后的反意疑问句用_____________?2)Letus…,后的反意疑问句用_____________?willyouwillyouwillyoushallweshallwewillyouHeishardly14yearsold,________?Hehasneverseenthefilm,________?Theyseldomtakeexercise,__________?Theyknewnothingaboutit,__________?ishehashedotheydidt
5、hey当陈述部分有hardly,barely,rarely,seldom,few,little,no,never,nothing,nobody,nowhere,等否定代词或否定副词时，反意疑问句部分要用肯定形式。Heisunfitforthejob,_________?Itisimpossibleforhimtwice,_________?Shedislikesapples,_____________?如果陈述句部分是带有否定前缀或后缀时，反意疑问句部分仍用否定结构。isn’theisn’titdoesn’tsheSomethingiswrong
6、withmyradio,______?Thisisaplane,_______?Nothingcouldstopmefromjoiningthesummercamp,_______?陈述部分的主语是everything,nothing,anything或something及指示代词this或that时，反意疑问句的主语应用代词it。isn’titisn’titcouldit陈述部分的主语是everybody,everyone,anybody,anyone,somebody,someone,nobody,noone,none,neither及指示代
7、词these或those时,其反意疑问句的主语需用复数代词theyEveryoneishere,___________?Nooneknowsaboutit,_________?Thesearegrapes，__________?aren’ttheydotheyaren’ttheyIdon’tthinkhecanfinishthework,__________?Idon’tbelievehewillcometomorrow,________?Iguesstheyhaven’theardabouttheplan,________?Hethinksth
8、atyouarehonest,_________?Youexpectedthatyoucouldhaveasurprise,______
