形式主语it的用法

it做形式主语用法大全(总2页)

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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：

+be+形容词+主语从句，如：

ItisuncertainwhetherhecancometoJenny’sbirthdaypartyornot.

+be+名词词组+主语从句，这类名词有：afact,apity,ashame,an

honour，aquestion等，如：

It’sapitythatyoumisdtheexcitingfootballmatch.

Itremainsaquestionwhetherhewillcomeornot.

+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.

+不及物动词(em,appear,happen等)+主语从句,这类不及物动词

有：appear,happen,em等，如：

Itemedthathedidn’ttellthetruth.

IthappenedthatIwasoutwhenhecalled.

+be+形容词+forsb.）+动词不定式

这类句型常用形容词easy,difficult,hard,important,possible，wi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.

Itisunwitogivethechildrenwhatevertheywant.

这类形容词有：easy,difficult,hard,important,possible，wi

+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,

lfish,considerate等。某人和这些形容词可以构成主系表结构。如：

It’sverykindofyoutohelpmewiththework.

=Youarekindtohelpme.

Itemedlfishofhimnottosharehisdictionarywithothers.

=Heemedlfishnottosharehisdictionarywithothers.

+be+名词词组+动词不定式，如：

Itisnotagoodhabittostayuptoolate.

+be+名词或形容词+动名词，这类名词和形容词常常是：good,no

good,nou,awasteof,uless,nless等，如：

It’sawasteoftimetalkingtoheranymore.

Itisnouarguingaboutthematterwithhim.

+take(sb.)+时间（金钱）+动词不定式，如：

Ittooktheworkersalmostthreeyearstofinishbuildingthedam.

Itwilltakeawholedaytogettothetopofthemountainonfoot.

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实战演练：

nerallyconsideredunwitogiveachildheorshewants.(NMET

1997)

er

isahardjobforthepolicetokeeporderinanimportantfootball

match.(2001上海)

tthatEnglishisbeingacceptedasaninternationallanguage.

(NMET1995)

ssarytotakeoffourshoeswhenweenterthelab(MET88)

5.________willtakeyoualotoftimetofindhiminthecrowd.

uhis_________there,thesituationishopelessnow.

gone

vertoolatetolearn,________

’’tit

8.___________isknowntoallthatShenzhouVILaunchedSuccessfully.

9._______isreportedinthenewspaper,theEarthquakeineastChina'sJiangxi

Provincekilled13people

10.___________certainthathisinventionwillmakepeople’slifeconvenient.

’’’s

11._________thatthereisanotherfootballmatchontheairthivening.

ssaid

12.__________thattheirdaughtergotanopportunitytostudyabroad.

’anexcitingnews

’xcitingnews

参考答案：

1——5BDDDA6——10CACAC11——12CD