Unit5+A+Delicate+World+Using+language 高中英语外研版（2019）选择性必修第二册.pptxVIP

Review

itasanempty

subject

e.g.Itisvitalfofthemnottotakeanychances.

e.g{Itisunfortunatethatthefilmisnolongerpopular.

theemptysubjecttherealsubject

aNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.

bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.

cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.

dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.

1Lookatthesentencesandanswerthequestions.Sentences(a)and(c)arefromthereadingpassage.

itasanemptyobject

NovisitorwouldthinkitsurprisingthattheislandisUNESCO..Site.

theemptyobjecttherealobject

译：没有人会认为这个岛屿是世界遗产这件事是令人惊奇的

即.所有人都认为这个岛屿是世界遗产这件事是名副其实的

it

Expertsfeltlitlnecessarytocomeupwithaplantoremovetherabbits.

theemptyobjecttherealobject

译：专家认为想出计划去移除所有兔子这件事是必要的

it

cExpertsfeltitnecessarytocomeupwithaplanto

removealltherabbitsfromtheisland.

dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.

it作形式宾语时，真正的宾语是不定式短语、ing短语或宾语从句

1.it代表不定式短语

e.g.Tomfeltitinterestingtolearnhowtocheckoutthesystem.

2.it代表ing短语(用得少)

3.it代表that引导的宾语从句

e.g.TomfeltitinterestingthatMaryalwayshithim.

Thered-earedslider,aspeciesoffreshwaterturtle,

isnativetotheSouthernUnitedStatesandNorthern

Mexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.

Thesedays,peoplehavefoundtoreleasetheseturtles

intothewildisathreattootherspecies.Expertsconsider

ownerskeepingtheirpetsinanenclosedareaimportant,andanyon