it做形式主語(yǔ)用法大全

1、It作形式主語(yǔ)常見(jiàn)句型作形式主語(yǔ)常見(jiàn)句型動(dòng)詞不定式，動(dòng)名詞或主語(yǔ)從句作主語(yǔ)時(shí)，通常把它們放在謂語(yǔ)動(dòng)詞前，而用it作形式主語(yǔ)，放到句首，常見(jiàn)句型有：1.Itbe形容詞形容詞主語(yǔ)從句，如：主語(yǔ)從句，如：ItisuncertainwhetherhecancometoJenny’sbirthdaypartynot.2.Itbe名詞詞組名詞詞組主語(yǔ)從句，這類名詞有：主語(yǔ)從句，這類名詞有：afactapityashameanhonour，aques

2、tion等，如：等，如：It’sapitythatyoumissedtheexcitingfootballmatch.Itremainsaquestionwhetherhewillcomenot.3.Itbe過(guò)去分詞過(guò)去分詞主語(yǔ)從句，這類過(guò)去分詞有：主語(yǔ)從句，這類過(guò)去分詞有：announcedbelievedexpectedhopeddecidedreptedsaidshown等，等，如：如：Itisreptedthat16people

3、werekilledintheearthquake.Itisnotdecidedwhowillgivetheoperationtothepatient.4.It不及物動(dòng)詞不及物動(dòng)詞(seemappearhappen等)主語(yǔ)從句主語(yǔ)從句這類不及物動(dòng)詞有：這類不及物動(dòng)詞有：appearhappenseem等，等，如：如：Itseemedthathedidn’ttellthetruth.IthappenedthatIwasoutwhenhec

4、alled.5.Itbe形容詞形容詞fsb.）動(dòng)詞不定式動(dòng)詞不定式這類句型常用形容詞這類句型常用形容詞easydifficulthardimptantpossible，wise等作表語(yǔ)，有時(shí)候等作表語(yǔ)，有時(shí)候?yàn)榱藦?qiáng)調(diào)不定式動(dòng)作的執(zhí)行者，常在不定式前加為了強(qiáng)調(diào)不定式動(dòng)作的執(zhí)行者，常在不定式前加fsb，如：，如：It’snecessaryftheyoungtomastertwofeignlanguage.Itisunwisetogiveth

5、echildrenwhatevertheywant.這類形容詞有：這類形容詞有：easydifficulthardimptantpossible，wise6.Itbe形容詞形容詞ofsb.動(dòng)詞不定式，這類形容詞常是表示心理品質(zhì)動(dòng)詞不定式，這類形容詞常是表示心理品質(zhì)性格特征的性格特征的形容詞，如：形容詞，如：kindnicestupidcleverfoolishpoliteimpolitesillyselfishconsiderate等。

6、等。某人和這些形容詞可以構(gòu)成主系表結(jié)構(gòu)。如：某人和這些形容詞可以構(gòu)成主系表結(jié)構(gòu)。如：It’sverykindofyoutohelpmewiththewk.=Youarekindtohelpme.Itseemedselfishofhimnottosharehisdictionarywithothers.=Heseemedselfishnottosharehisdictionarywithothers.7.Itbe名詞詞組名詞詞組動(dòng)詞不定式

7、，如：動(dòng)詞不定式，如：Itisnotagoodhabittostayuptoolate.8.Itbe名詞或形容詞名詞或形容詞動(dòng)名詞，這類名詞和形容詞常常是：動(dòng)名詞，這類名詞和形容詞常常是：goodnogoodnouseawasteofuselesssenseless等，如：等，如：It’sawasteoftimetalkingtoheranyme.Itisnousearguingaboutthematterwithhim.9.Ittak

8、e(sb.)時(shí)間（金錢(qián)）時(shí)間（金錢(qián)）動(dòng)詞不定式，如：動(dòng)詞不定式，如：Ittookthewkersalmostthreeyearstofinishbuildingthedam.Itwilltakeawholedaytogettothetopofthemountainonfoot.實(shí)戰(zhàn)演練：實(shí)戰(zhàn)演練：1.Itisgenerallyconsideredunwisetogiveachildheshewants.(NMET1997)A.howev

9、erB.whateverC.whicheverD.whenever2.Infactisahardjobfthepolicetokeepderinanimptantfootballmatch.(2001上海上海)A.thisB.thatC.thereD.it3.isafactthatEnglishisbeingacceptedasaninternationallanguage.(NMET1995)A.ThereB.ThisC.ThatD.

10、It4.Isnecessarytotakeoffourshoeswhenweenterthelab(MET88)A.everyoneB.thisC.herD.it5.________willtakeyoualotoftimetofindhiminthecrowd.A.ItB.IC.WeD.They6.Itisnousehis_________therethesituationishopelessnow.A.togoB.tobegoing

11、C.goingD.havinggone7.Itisnevertoolatetolearn________A.isitB.isn’titC.doesitD.doesn’tit8.___________isknowntoallthatShenzhouVILaunchedSuccessfully.A.AsB.WhatC.ItD.That9._______isreptedinthenewspapertheEarthquakeineastChin

12、asJiangxiProvincekilled13peopleA.ItB.AsC.ThatD.What10.___________certainthathisinventionwillmakepeople’slifeconvenient.A.That’sB.ThisisC.It’sD.What’s11._________thatthereisanotherfootballmatchontheairthisevening.A.Itsays