常用it作形式主语的句型结构Word格式文档下载.docx

常用it作形式主语的句型结构Word格式文档下载.docx

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said,reported,announced,hoped,thought，told，believed，expected，decided，suggested,known等。

如：

①Itishopedthatonedaytheywillhaveenoughanimalstosetthemfree

②Itiswellknownthattheearthgoesaroundthesun.

③Itissuggestedthatthesportsmeeting（should）beputoffuntilnextweek.

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:

apity，anhonor，agoodthing，afact，asurprise，goodnews,one’sduty等。

①Itisapity（that）youmissedthesportsmeetinglastweek.

②ItisafactthatEnglishisbeingacceptedasaninternationallanguage.

◇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。

①Itseemsthatthereisabigwastepipecomingdownfromthetown.

→Thereseemstobeabigwastepipecomingdownfromthetown.

②Heappearedtobecalm,butinsidehisheartwasbeatingwildlywithfear.

→Itappearedthathewascalm,butinsidehisheartwasbeatingwildlywithfear.

◇Itdoesn'

tmatter（It’snowonder;

Itdoesn’tmakemuchdifference等）

＋when/where/which/whether等从句。

①Doesitmatterifhecan'

tfinishthejobontime?

②Theyareallclassmates.Itisnowonder

theyshouldhelpeachotherwiththeirstudies.

◇It+be+adj./n.（forsb./ofsb.）+todosth.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。

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

’ttel

lthetruth.

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。

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

orshewants.（NMET1997）

A.howeverB.whateverC.

whicheverD.whenever

2.Infactisahardjobforthepolicetokeeporder

inanimportantfootballmatch.（2001上海）

A.thisB.thatC.

thereD.it

3.isafactthatEnglishisbeingacceptedasan

internationallanguage.（NMET1995）

A.ThereB.ThisC.

ThatD.It

he

4.

Is

necessarytotakeoffourshoeswhenweenter

thelab?

（MET88）

A.everyone

B.this

C.

her

D.it

5.

________willtakeyoualotoftimetofindhiminthecrowd.

A.It

B.I

We

D.They

6.

Itisnousehis_________there,thesituationishopelessnow.

A.togo

B.tobegoing

C.going

D.havinggone

7.

Itisnevertoolatetol