2017-2018學年人教課標高一英語必修3輔導Unit4AstronomyGRAMMAR

主語從句【語境展示】觀察下面句子，并試著歸納主語從句的用法要點。1.Thathehadfinishedwritingthepositioninsuchashorttimesurprisedusall.2.Whethertheplanistobecarriedoutstillneedstobediscussed.3.Whowillgototheenergyconferenceisnotimportant.4.WhatIwantedwasafewdays'rest.5.Whichhotelheisstayingatisunknowntous.

6.Whenthesportsmeetingwillbeheldhasnotbeendecidedyet.7.Whereweshouldleavethegarbageisaproblem.8.Whyheisn'theretodayisamystery.9.Howthemandiedpuzzledusall.【自我歸納】在復合句中，擔任主語的從句叫主語從句（句1句9）。引導主語從句的詞有：連詞that,whether（句1、句2）；連接代詞who,what,which（句3句5）；連接副詞when,where,why,how（句6句9）等。一、由連詞that,whether引導的主語從句

1.that引導主語從句時，無實際意義，只起連接作用，不充當任何句子成分，當它引導的主語從句置于句首時，that不能省略（句1）。

2.whether意為“________”，不可以省略（句2）。二、由連接代詞who,what,which引導的主語從句

連接代詞who,what,which引導主語從句時，在從句中充當主語、賓語或________等（句3句5）。三、由連接副詞when,where,why,how引導的主語從句

連接副詞when,where,why,how引導主語從句時，在從句中充當狀語（句6句9）?！就卣埂慨斨髡Z較長時，常用it作形式主語，而將主語從句放在句末。如：Itisknowntoallthatlighttravelsinstraightlines.Itwasclearenoughwhathemeant.Ithasnotbeenannouncedwhentheplaneistotakeoff.常見的由it作形式主語的句型如下：①It+be+名詞+從句。常用于此句型的名詞有：fact,rule,pleasure,truth,pity,mystery等。如：ItisafactthatEnglishisbeingacceptedasaninternationallanguage.Itisapitythatyoucan'tswim.Itwasamysteryhowthethiefgotin.②It+be+形容詞+從句。常用于此句型的形容詞有：true,important,strange,necessary,clear,certain等。如：Itistruethattheearthisround.Itisstrangethatheknowsnothingaboutit.Itwasnotcleartomewhyhebehavedlikethat.③It+動詞+從句。常用于此句型的動詞有：seem,appear,happen,follow等。如：Itseemsthatyou'reright.IthappenedthatMarywasn'tathomethatday.④It+be+過去分詞+從句。常用于此句型的過去分詞有：known,said,proved,reported,suggested等。如：Isitknownwherehewent?It'ssaidthathewasaspyduringthewar.注意：1.that引導的主語從句置于句首時，that不能省略。但是如果用it作形式主語，而把主語從句放在句末時，that可以省略。如：Thatyourpicturesshouldsurprisethemwasquitenatural.Itwasquitenatural(that)yourpicturesshouldsurprisethem.2.如果主語從句置于句首，則不能用if引導，而用whether。但如果用it作形式主語，而把主語從句放在句末時，也可以用if引導。如：WhetherTomreallysawSharonwasdoubtful.

Itwasdoubtfulwhether/ifTomreallysawSharon.【即學即練】用適當?shù)倪B接詞完成下面短文。Iliveonthetopfloorofanapartmentblock.Justacrosstheroadisabakery.1.________thebakerywasbuiltwasunknowntome,butseenfromitslook,itmusthaveahistoryofover100years.It’sobviousfromthefloodofcustomers2.________it’squitepopular.It’sfunny3.________fondIamofthislittlebakeryasIdon’tlikebread.4.________itprovidesmewithisendlesschancestowatchpeopleeandgo.Amongsomanypeople,5.________impressesmethemostisahomelessmanthatspendshisdaystalkingtothepigeons(鴿子)justoutsideourflats.Wealwaysnodtoeachotherorsay“hello”and6.________heappearsthereeverydayhasbeearemindertoslowdownonthebusystreet.I’msittinghereatmydeskwithacupoftea.Itseems7.________timejustwentpastandlandedmehereonthisislandinthisadultbody.Beingontheothersideoftheworldgivesmesomuchroomtogrow,givingpeopleandplacesfrombackhomeadeepsenseofsignificance.Ialwayswantedtolivebythebeachinahotcountry,traveltheworldandlearnanotherlanguage.But8.________I’velearnthere