常用it作形式主语的句型结构.docx
- 文档编号:1575249
- 上传时间:2022-10-23
- 格式:DOCX
- 页数:24
- 大小:83.13KB
常用it作形式主语的句型结构.docx
《常用it作形式主语的句型结构.docx》由会员分享,可在线阅读,更多相关《常用it作形式主语的句型结构.docx(24页珍藏版)》请在冰豆网上搜索。
常用it作形式主语的句型结构
常用it作形式主语的句型结构
◇ It+be+形容词+that-从句
可用于此句型的形容词有:
wonderful, true,good,right,wrong,(un)important,useless,surprising,clear,unusual,lucky,certain,necessary等。
如:
①It is quite certain thathe will be at the meeting.
②Itissurprisingthathecamelatetoschoolthismorning.
③It is important that we (should) study hard
注意:
该句型中的形容词是(un)important,necessary等时,从句应为(should)+动词原形。
◇ It+be+-ed分词+that-从句
适用该句型的过去分词主要有:
said, reported, announced, hoped, thought,told,believed,expected,decided,suggested, known等。
如:
①It is hoped that one day they will have enough animals to set them free
②Itiswellknownthattheearthgoesaroundthesun.
③Itissuggestedthatthesportsmeeting(should)beputoffuntilnextweek.
注意:
该句型的过去分词是suggested时,从句应为(should)+动词原形。
◇ It+be+名词+that-从句
适用该句型的名词(词组)有:
a pity,an honor,a good thing,a fact,a surprise,good news,one’sduty等。
如:
①It is a pity (that) you missed the sports meeting last week.
②It is a fact that English is being accepted as an international language.
◇ It +seem/ appear/ happen的适当形式+that从句。
该句型常可以转换成含不定式的简单句。
如:
①It seems that there is a big waste pipe coming down from the town.
→There seems to be a big waste pipe coming down from the town.
②He appeared tobecalm, but inside his heart was beating wildly with fear.
→It appeared that he was calm, but inside his heart was beating wildly with fear.
◇ It doesn't matter (It’snowonder;Itdoesn’tmakemuchdifference等)
+ when/ where/ which/ whether 等从句。
如:
①Does itmatter if he can't finish the job on time?
②They are all classmates.Itis no wonder
they should help each other with their studies.
◇ It + be + adj./ n. (for sb. / of sb.) + to do sth. 该句型中的形容词通常是表示事物的特点或特征的如difficult,hard,easy,impossible,necessary,important等,此时用for;或表示人的性格特征或特点的如nice,good,bad,kind,silly,foolish,wise,clever, careless,rude,brave,cruel,careful, grateful等,这时要用 of。
如:
①Itisfoolishofyoutogiveupsuchagoodchance.
②Itisnecessaryforcollegestudentstomasteratleastaforeignlanguage
It作形式主语常见句型
动词不定式,动名词或主语从句作主语时,通常把它们放在谓语动词前,而用it作形式主语,放到句首,常见句型有:
1.It+be+形容词+主语从句,如:
ItisuncertainwhetherhecancometoJenny’sbirthdaypartyornot.
2.It+be+名词词组+主语从句,这类名词有:
afact,apity,ashame,anhonour,aquestion等,如:
It’sapitythatyoumissedtheexcitingfootballmatch.
Itremainsaquestionwhetherhewillcomeornot.
3.It+be+过去分词+主语从句,这类过去分词有:
announced,believed,expected,hoped,decided,reported,said,shown等,如:
Itisreportedthat16peoplewerekilledintheearthquake.
Itisnotdecidedwhowillgivetheoperationtothepatient.
4.It+不及物动词(seem,appear,happen等)+主语从句,这类不及物动词有:
appear,happen,seem等,如:
Itseemedthathedidn’ttellthetruth.
IthappenedthatIwasoutwhenhecalled.
5.It+be+形容词+forsb.)+动词不定式
这类句型常用形容词easy,difficult,hard,important,possible,wise等作表语,有时候为了强调不定式动作的执行者,常在不定式前加forsb,如:
It’snecessaryfortheyoungtomastertwoforeignlanguage.
Itisunwisetogivethechildrenwhatevertheywant.
这类形容词有:
easy,difficult,hard,important,possible,wise
6.It+be+形容词+ofsb.+动词不定式,这类形容词常是表示心理品质,性格特征的形容词,如:
kind,nicestupid,clever,foolish,polite,impolite,silly,selfish,considerate等。
某人和这些形容词可以构成主系表结构。
如:
It’sverykindofyoutohelpmewiththework.
=Youarekindtohelpme.
Itseemedselfishofhimnottosharehisdictionarywithothers.
=Heseemedselfishnottosharehisdictionarywithothers.
7.It+be+名词词组+动词不定式,如:
Itisnotagoodhabittostayuptoolate.
8.It+be+名词或形容词+动名词,这类名词和形容词常常是:
good,nogood,nouse,awasteof,useless,senseless等,如:
It’sawasteoftimetalkingtoheranymore.
Itisnousearguingaboutthematterwithhim.
9.It+take(sb.)+时间(金钱)+动词不定式,如:
Ittooktheworkersalmostthreeyearstofinishbuildingthedam.
Itwilltakeawholedaytogettothetopofthemountainonfoot.
实战演练:
1.Itisgenerallyconsideredunwisetogiveachild heorshewants.(NMET1997)
A.however B.whatever C.whichever D.whenever
2.Infact isahardjobforthepolicetokeeporderinanimportantfootballmatch.(2001上海)
A.this B.that C.there D.it
3. isafactthatEnglishisbeingacceptedasaninternationallanguage.(NMET1995)
A.There B.This C.That D.It
4.Is necessarytotakeoffourshoeswhenweenterthelab?
(MET88)
A.everyone B.this C.her D.it
5.________willtakeyoualotoftimetofindhiminthecrowd.
A.It B.I C.We D.They
6.Itisnousehis_________there,thesituationishopelessnow.
A.togo B.tobegoing C.going D.havinggone
7.Itisnevertoolatetolearn,________?
A.isit B.isn
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 常用 it 形式 主语 句型 结构