不定式、动名词用作主语不定式、动名词用作主语动名词作主语动名词作主语11。直接作主语：。直接作主语：（（11）眼见为实。）眼见为实。（（22）天天做早操有益于健）天天做早操有益于健康。康。（（33）吸烟不是好习惯。）吸烟不是好习惯。11.Seeing.Seeingisbelieving.isbelieving.2.2.DoingmorningexercisesDoingmorningexerciseseverydayeverydayisgoodforhealthisgoodforhealth3.3.SmokingSmokingisnotagoodhabitisnotagoodhabit2.2.用用itit作形式主语，常与作形式主语，常与nouse,nogood,useless,worthwhilenouse,nogood,useless,worthwhile连用连用（（11）广说不做没用）广说不做没用（（22）做无益的后悔没用）做无益的后悔没用（（33）吸烟太多无益）吸烟太多无益（（44）学好英语是值得做）学好英语是值得做的的1.It’snousetalkingtoomuchwithout1.It’snousetalkingtoomuchwithoutdoinganythingdoinganything2.It’suselesscryingoverthespiltmilk.2.It’suselesscryingoverthespiltmilk.3.It’snogoodsmokingtoomuch3.It’snogoodsmokingtoomuch4.It’sworthwhilelearningEnglishwell.54.It’sworthwhilelearningEnglishwell.5不定式作主语不定式作主语11。直接作主语。直接作主语（（11）眼见为实）眼见为实（（22）今天早晨做早操对身体无）今天早晨做早操对身体无益益（（33）在这里吸烟很危险）在这里吸烟很危险1.Toseeistobelieve1.Toseeistobelieve2.Todomorningexercisestodayisnot2.Todomorningexercisestodayisnotgoodforhealth.goodforhealth.3.Tosmokehereisdangerous3.Tosmokehereisdangerous22。用。用itit作形式主语，有自己特定的句型作形式主语，有自己特定的句型（（11）你这么说真是太好了）你这么说真是太好了（（22）他说出这样的话太愚蠢了）他说出这样的话太愚蠢了（（33）我们学好英语是必要的）我们学好英语是必要的（（44）你们学好英语语法并不难）你们学好英语语法并不难1.Itisverykindofyoutosayso.1.Itisverykindofyoutosayso.2.It’sveryfoolishofhimtosaysuchthings2.It’sveryfoolishofhimtosaysuchthings3.ItisnecessaryforustolearnEnglishwell3.ItisnecessaryforustolearnEnglishwell4.It’snotdifficultforyoutolearnwellEnglish4.It’snotdifficultforyoutolearnwellEnglishgrammargrammar3.3.固定句型固定句型（（11）李垒每天花两个半小时完成作业）李垒每天花两个半小时完成作业（（22）你昨晚用多长时间写完的作文？）你昨晚用多长时间写完的作文？1.IttakesLiLeitwoandahalfhourstocompletehishomework.1.IttakesLiLeitwoandahalfhourstocompletehishomework.2.Howlongdidittakeyoutofinishwritingyourcomposition?2.Howlongdidittakeyoutofinishwritingyourcomposition?小结：动名词与不等式作主语时的区别小结：动名词与不等式作主语时的区别一、对称原则一、对称原则二、特殊表达二、特殊表达三、固定句型三、固定句型四、习惯用法四、习惯用法主语和表语对称主语和表语对称动名词表示经常性、反复发生的动作动名词表示经常性、反复发生的动作不等式表示具体的、某一次的动作不等式表示具体的、某一次的动作IttakessbsometimetodosthIttakessbsometimetodosthIt’sIt’snouse/nogood/useless/worthwhilenouse/nogood/useless/worthwhile++doingdoing……It’sIt’skind/wise/cleverkind/wise/clever……ofofsbtodosthsbtodosthIt’sIt’simportant/necessary/hardimportant/necessary/hard……forforsbsbtodotodosthsthTask:Task:completethefollowingcompletethefollowingsentencessentences1.1.________________(________________(没有用没有用)learningwithoutpractice)learningwithoutpractice2.2.It’snogood________________________________It’snogood________________________________（广说不做）（广说不做）3.3.It’snecessary_____________________________(It’snecessary_____________________________(我们学好英语）我们学好英语）4.4.It’verykind____________________________It’verykind______...
