2020_2021学年新教材高中英语UNIT2HEALTHYLIFESTYLE突破语法大冲关学案含解析新人教版选择性必修第三册202101202130.doc

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1、UNIT2HEALTHYLIFESTYLE不定式作主语【观察例句】1．Tosayisonethingandtodoisanother.2．It'srudetoturnyourbacktoyourteacherandrefusetoanswer.3．Itisimpossibletolearnaforeignlanguagewithoutmakingpainstakingeffort.4．Itseemedapitytohavewastedsomuchtime.【归纳用法】1．把不定式置于句首。如：T

2、ogettherebybikewilltakeushalfanhour.骑自行车到那儿将花费我们半个小时。Tomakeaplanfirstisagoodidea.首先制定好计划是个好主意。2．用it作形式主语，把真正的主语不定式置于句后，常用于下列句式中。如：(1)It＋be＋名词＋todoIt'sourdutytotakegoodcareoftheold.照顾好老人是我们的责任。(2)Ittakessb.＋sometime＋todoHowlongdidittakeyoutofinishthew

3、ork?你花了多少时间来完成这项工作？(3)It＋be＋形容词＋forsb.＋todoItisdifficultforustofinishwritingthecompositioninaquarterofanhour.我们难以在15分钟内完成这篇作文。(4)Itseems(appears)＋形容词＋todoItseemedimpossibletosavemoney.省钱似乎不可能。(5)It＋不定式结构可位于believe/consider/discover/expect/find/think和

4、wonder之后Hethoughtitwouldbesafertogobytrain.他认为乘火车比较安全。(6)不定式的完成式也可作句子的主语Tohavemadethesamemistaketwicewasunforgivable.犯同样的错误两次是不可原谅的。Itisbettertohavelovedandlostthannevertohavelovedatall.爱过之后失去了爱，比从未爱过要好。[即学即练1]　单句语法填空①Tomake(make)upforlosttimeisnotpo

5、ssible.②Itisgoodforyourstudytodiscuss(discuss)withyourclassmates.3．不定式和动名词作主语的区别(1)动名词作主语通常表示抽象动作；而不定式作主语表示具体动作。Smokingisprohibitedhere.这里禁止抽烟。(抽象)Itisnotverygoodforyoutosmokesomuch.你抽这么多烟对你身体很不好。(具体)(2)动名词作主语时，通常用以表示一件已知的事或经验；不定式短语通常用来表示一件未完成的事或目的。C

6、limbingmountainsisinteresting.爬山很有趣。(经验)Tofinishthetaskwilltakealongtime.要完成这项任务将要花费很长时间。(具体)[即学即练2]　单句语法填空①Watching(watch)newsonTVhasbecomearoutineforme.②Ittookmeonlyfiveminutestofinish(finish)thejob.Ⅰ.单句语法填空1．Tolean(lean)outofthewindowisdangerous.2

7、．Tosave(save)moneynowseemsimpossible.3．Itisanoffencetodrop(drop)litterinthestreet.4．Itisstupidofyoutowrite(write)downeverything(that)theteachersays.5．Driving(drive)acarduringtherushhouristiring.Ⅱ.短文语法填空Ihavealotofhobbies1.whenIstudiedincollege.Itwash

8、ardformetosavemoney2.tokeep(keep)myhobbies.Itwasfoolishofme3.tospend(spend)plentyoftimewiththose.But4.tostudy(study)hardwasmyfirsttaskatthattime.Ioftengotupearly5.tocatch(catch)upwithotherstudents.Ittookmetwoterms6.tomake(make)upformylosttime.Ithink7