Unit+5+A+Delicate+World+Period+2+Grammar 高二英语外研版（2019）选择性必修第二册

外研选择性必修第二册Unit5Period2Grammar12ToknowtheusageofitasanemptyobjectTouseitasanemptyobjectcorrectly目标一：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:我发现，可以用it作形式宾语替代的成分有：______________，______________，______________。不定式动名词从句当不定式、动名词或从句在某个句子中做宾语时，为了保持句子的结构平衡，常用it作为形式宾语，而将真正的宾语放到句子的后部去。【语法精讲】1it作为形式宾语可以分为两种情况：(1)代表不定式。例如：

Idon’tfeelitdifficulttounderstandthepassage.(2)代表连接代词或连接副词引导的从句或动名词。例如：Hehasn’tmadeitclearwhenheiscomingback.Theprofessorconsidersitnogoodreadingwithoutunderstanding.2几种特殊情况1）动词+it+that从句，常见于take，have，put等动词之后。例如：Itakeitthathewillfinishthetaskbyhimself.（我认为他能自己完成这项任务。）2）动词+it+when/if从句，常见于appreciate，enjoy，like，prefer等词之后。例如：Wereallyappreciateitifyoucoulddousafavour.（如果您能帮助我，我们会很感激。）3）动词+it+介词短语+that从句，常见于oweittosb，takeitforgranted等结构中。例如：Weoweittoyouthatwearestillalive.（多有你，我们现在才仍然活着。）4）动词+介词+it+that从句，常见于lookto，dependon，insiston，stickto，answerfor等结构中。例如：Sheinsistedonitthatshewasinnocent.（她坚持说自己是无辜的。）5）动词+it+过去分词+从句。例如：Hemadeitknowntoeveryonethathewasright.（他让每个人都明白他是对的。）目标二: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