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外研選擇性必修第二冊(cè)Unit5Period2Grammar12ToknowtheusageofitasanemptyobjectTouseitasanemptyobjectcorrectly目標(biāo)一:ToknowtheusageofitasanemptyobjectActivity1:Lookatthesentencesandanswerthequestions.Sentence(a)and(c)arefromthereadingpassage.a.NovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.b.NovisitorwouldthinkthatislandbeingaUNESCOWorldHeritageSiteissurprising.c.Expertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.d.Expertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.1Whatdoes“it”refertointhesentences(a)and(c)?“It”
insentence(a)refersto“theislandisaUNESCOWorldHeritageSite”.“It”
insentence(c)refersto“tocomeupwithaplantoremovealltherabbitsfromtheisland”2Whatisthedifferencebetweenthesentencesineachgroup?Whentheobjectofasentenceisathat-clause
(b)oraninfinitive(d),wesometimesuse“it”
asanemptyobjectandputtherealobjectlatertokeepbalance.Forexample,sentence(a)uses
“it”
astheemptyobjectof“think”,referringtotherealobject:“theislandisaUNESCOWorldHeritageSite”.Sentence(b)usesthat-clauseastheobjectof“think”.Nowlookformoresentenceswiththisstructureinthereadingpassage,andsummariseitsusesinyourownwords.1)Thisincidentmadeitclearthatrat,mouseandrabbitproblemneededsolvingonceandforall....Activity2:Readthefollowingsentencesandsummarisewhatcanbeuseditasanemptyobject.1
Theyfeltitdifficulttofinishtheworkinsuchashorttime.2Hethoughtitabsolutelysenselessattemptingtheimpossible.3Itookitforgrantedthattheywouldnotcome.Summary:我發(fā)現(xiàn),可以用it作形式賓語(yǔ)替代的成分有:______________,______________,______________。不定式動(dòng)名詞從句當(dāng)不定式、動(dòng)名詞或從句在某個(gè)句子中做賓語(yǔ)時(shí),為了保持句子的結(jié)構(gòu)平衡,常用it作為形式賓語(yǔ),而將真正的賓語(yǔ)放到句子的后部去?!菊Z(yǔ)法精講】1it作為形式賓語(yǔ)可以分為兩種情況:(1)代表不定式。例如:
Idon’tfeelitdifficulttounderstandthepassage.(2)代表連接代詞或連接副詞引導(dǎo)的從句或動(dòng)名詞。例如:Hehasn’tmadeitclearwhenheiscomingback.Theprofessorconsidersitnogoodreadingwithoutunderstanding.2幾種特殊情況1)動(dòng)詞+it+that從句,常見(jiàn)于take,have,put等動(dòng)詞之后。例如:Itakeitthathewillfinishthetaskbyhimself.(我認(rèn)為他能自己完成這項(xiàng)任務(wù)。)2)動(dòng)詞+it+when/if從句,常見(jiàn)于appreciate,enjoy,like,prefer等詞之后。例如:Wereallyappreciateitifyoucoulddousafavour.(如果您能幫助我,我們會(huì)很感激。)3)動(dòng)詞+it+介詞短語(yǔ)+that從句,常見(jiàn)于oweittosb,takeitforgranted等結(jié)構(gòu)中。例如:Weoweittoyouthatwearestillalive.(多有你,我們現(xiàn)在才仍然活著。)4)動(dòng)詞+介詞+it+that從句,常見(jiàn)于lookto,dependon,insiston,stickto,answerfor等結(jié)構(gòu)中。例如:Sheinsistedonitthatshewasinnocent.(她堅(jiān)持說(shuō)自己是無(wú)辜的。)5)動(dòng)詞+it+過(guò)去分詞+從句。例如:Hemadeitknowntoeveryonethathewasright.(他讓每個(gè)人都明白他是對(duì)的。)目標(biāo)二:TouseitasanemptyobjectcorrectlyActivity1:Rewritetheunderlinedpartsusingitasanemptyobject.Thered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.Thesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheir
petsshouldtakethemtoan
appropriateanimalshelter.1manypeoplethinkkeepingthisturtleasapetisagoodidea2believetoreleasethemintothewildisnobigissue3peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies4Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant.manypeoplethinkitagoodideatokeepthisturtleasapetbelieveitnobigissuetoreleasethemintothewildpeoplehavefounditathreattootherspeciestoreleasetheseturtlesintothewildExpertsconsideritimportantforownerstokeeptheirpetsinanenclosedarea.Activity2:LookatthepicturesoftheSaihanbaNationalForestParkanddescribeitschangesusingitasanemptyobjectwhereappropriate.Youmayrefertothewordsandexpressionsinthetableforhelp.1960spresentdaynouns/adjectivestodo/thatbreakthroughimpossiblelikelyunrealistic…growinvestigateplanttreestransform…Ithinkitabreakthroughtotransformadesertintoaforest...Ibelieveitlikelythatmorevolunteerswillhelpplantmoretreesaroundthepark.Ifinditimpossibletoinvestigateallthelivingspeciesintheparkatpresent.Ifeelitunrealisticforthelocalpeopletogrowriceandwheatforgrainind
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