Unit 1 Discover useful structures(表语从句讲练)学案-2022-2023学年高中英语人教版2019选择性必修第二册

选修二U1单元语法——表语从句概念：表语从句是在复合句中作表语的名词性从句。放在系动词之后,一般结构是“主语+系动词+表语从句”。可以接表语从句的连系动词有be,look,feel,keep,become,get,prove,remain,seem等。可以接表语从句的系动词：be动词am，is，are感官动词look，sound，taste，smell，feel持续性动词keep，stay，remain变化系动词get，become，grow，turn，go表象系动词seem，appear终止系动词prove，turnout三、表语从句的引导词1.由连词that，whether引导的表语从句that无实际意义，只起连接作用，而whether有实义，意为“是否”。此时主句的主语通常是抽象名词，如problem，result，chance，suggestion，question，reason等。表从对主句主语进行解释、说明等。例：事实是他不想加入我们。Thefactisthathedoesn’twanttojoinus.我的建议是我们应该告诉他。Mysuggestionisthatweshouldtellhim.问题是这部电影是否值得看。Thequestioniswhetherthefilmisworthseeing.问题还是他们能否帮我们。Theproblemremainswhethertheywillbeabletohelpus.【注意】whether可引导表语从句，但if不行。由连接代词引导的表语从句由连接代词who，what，which，whose，whom，whatever，whichever，whoever，whomever等引导的表语从句，在表语从句中有词义，句子中担任成分，不能省略(有ever的为泛指，“无论......”。)。例：问题是谁能做这项工作。Theproblemiswhocandothework.这是我想强调的。That’swhatIwanttostress.由连接副词引导的主语从句。连接副词when，where，how，why，whenever，wherever等引导的表语从句，连接副词有具体含义，且在从句中作状语。例：这就是他没有来的缘故。That’swhyhedidn’tcome.问题是我们如何找到他。Theproblemishowwecanfindhim.由连接词because，asif/asthough等引导的表语从句例：这是因为我们从未想过此事。That'sbecauseweneverthoughtofit.好像他不知道答案。Itseemsasifhedidn’tknowtheanswer.四、注意事项：1.判断正误：Thequestioniswhencanwegetapayrise.（×） Thequestioniswhenwecangetapayrise.（√）结论：__表语从句一定要用陈述语序.判断正误：Thequestionisiftheenemyismarchingtowardsus.（×）Thequestioniswhethertheenemyismarchingtowardsus.（√）Itlookedasifhehadunderstoodthisquestion.（√）结论：if不能引导表从，要用whether。(asif例外）asif/asthough引导表从的时态问题填空：（1）Darkcloudsaregathering.Itseemsasifit___isgoingtorain_______(rain)（2）Youwillfeelasifyou__were___(be)athomehere.（3）Localpeoplesaidafterthestormitwasasifthere__hadbeen___(be)anuclearexplosion.结论：asif引导的表从的内容有明显的依据，很有可能发生，就用陈述语气。反之，则用虚拟语气。虚拟语气的构成：比较主从句的两个动作，同时发生，就用一般过去时表示虚拟（be动词只能用were）；从句动作明显发生在主句动作之前，就用过去完成时表虚拟。判断正误：Wereceivedtheorderthatweleftatonce.（×）Wereceivedtheorderthatweshouldleaveatonce.（√）结论：主句的主语是要求、建议、命令等词，表语从句的谓语动词要用“should+动词原形”；其中，should可以省略。这类词有：request/requirement（要求）、proposal/advice/suggestion/recommendation（建议）、order/instruction（命令）表从的常见句型：Thereasonisthat...（原因是......）This/That

is

why...（这是......的原因，指由于各种原因所造成的结果。）It/This/That

is

because...（这是因为......，指原因或理由。）That

is

the

reason

why...=That’swhy...课后练习一、填入恰当的连接词1.____________Iwanttoknowis__________roadweshouldtake.2.

Theresultoftheinventionofsteamenginewas__________humanpowerwasreplacedbymechanicalpower.3.—Whatamess!Youarealwayssolazy!—I’mnottoblame,mum.Iam________youhavemademe.4.Themainquestionis____________youwantyourarmsinsideoroutsidethesleepingbag.5.AsJohnLennononcesaid,lifeis_________happenstoyouwhileyouarebusymakingotherplans.6.

Pleaseputthemedicineonthetopoftheshelf.It’s__________ourchildrencan’treachit.7.Thelasttimewehadgreatfuntogetherwas___________wewerevisitingtheWaterPark.8.

Thelittlegirl_________gotlostdecidedtoremain___________shewasandwaitforhermother.9.Ashipinharbourissafe,butthat’snot__________shipsarebuiltfor.10.Actually,girlscanbe__________theywanttobejustlikeboys,___________itisapilot,anastronaut,oramanager.11.Fromspace,theearthlooksblue.That’s_____________about71%ofitssurface_____________(cover)bywater.12.Hewasbornhere.That’s___________helikestheplacesomuch.13.Itseems____________thebrainispreservingitsmostimportantmemories.14.Theteacher’srequirementis___________we__________(recite)thepassageintwentyminutes.15.Allsheisworriedaboutis____________heisallright.16.—DoyouthinkitiswiseforChinesemotherstotrytodoeverythingfortheirchildren?—No,that’s__________theyaremistaken.17.Sorry,hecan’tgowithyou.Thereasonis___________hehassomethingtodotomorrow.18.Thereason_________heisabsentfromthemeetingis_________heisill.

19.Heisill.That’s___________heisabsentfromthemeeting.20.Heisabsentfromthemeeting.That’s_____________heisill.21.Youaresaying_________webornequalandthat’s_________Iagree.22.Thequestionis__________wewillhaveoursportsmeetingnextweek.23.Hewasill.That’s___________hewassenttothehospital.24.That’s___________thedirectcurrentalwaysflowsinawireinonedirection.25.Thisis__________heatcanmeltice,vaporizewaterandcausebodiestoexpand.二、翻译句子。1.他已经不是以前的他了。________________________________________________________麻烦的是我把他的地址丢了。________________________________________________________问题是我们应当相信谁。________________________________________________________问题是什么时候他才能到达酒店。________________________________________________________我们似乎应该对此事负责。________________________________________________________看起来好像要下雪了。________________________________________________________你爸爸想知道的是你跟同学们相处得怎么样。________________________________________________________我的建议是我们应该帮他想个办法。________________________________________________________原因是你不信任她。________________________________________________________你说我们生而平等，那是我同意你的地方。________________________________________________________

答案：一、填入连接词：1.What，which2.that3.what4.whether5.what6.where7.when8.who,where9.what10.whatever,whether11.because,iscovered12.why13.that/asif14.that,(should)recite15.whether16.where17.that18.why,th