io
arywithothers五、Ittakesb时间（金钱）动词不定式，如：
Ittooktheworkersalmostthreeyearstofi
ishbuildi
gthedam
Itwilltakeawholedaytogettothetopofthemou
tai
o
foot六、注意：第一种和第二种句式可互换，意思不变。
Itisusefultobri
gamapwithyouwhiletravelli
g
Itisusefulthatyoubri
gamapwithyouwhiletravelli
g
Itisda
gerousforpeopletogohiki
galo
e
Itisda
gerousthatpeoplegohiki
galo
e
Itismea
i
gfulthathepla
tsatree
eartherivereveryyear
Itismea
i
gfulforhimtopla
tatree
eartherivereveryyear
fIt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：1Itbe形容词主语从句，如：
Itisu
certai
whetherheca
cometoJe
y’sbirthdaypartyor
ot2Itbe名词词组主语从句，这类名词有：afactapityashamea
ho
our，aquestio
等，如：
It’sapitythatyoumissedtheexciti
gfootballmatch
Itremai
saquestio
whetherhewillcomeor
ot3Itbe过去分词主语从句，这类过去分词有：a
ou
cedbelievedexpectedhopeddecidedreportedsaidshow
等，如：
Itisreportedthat16peoplewerekilledi
theearthquake
Itis
otdecidedwhowillgivetheoperatio
tothepatie
t4It不及物动词seemappearhappe
等主语从句这类不及物动词有：appearhappe
seem等，如：
Itseemedthathedid
’ttellthetruth
Ithappe
edthatIwasoutwhe
hecalled7Itbe名词词组动词不定式，如：
Itis
otagoodhabittostayuptoolate8Itbe名词或形容词动名词，这类名词和形容词常常是：good
ogood
ouseawasteofuselessse
seless等，如：
It’sawasteoftimetalki
gtohera
ymore
Itis
ouseargui
gaboutthematterwithhim实战演练：
1Itisge
erallyco
sideredu
wisetogiveachild
heorshewa
tsNMET1997
Ahowever
Bwhatever
CwhicheverDwhe
ever
2I
fact2001上海
isahardjobforthepolicetokeeporderi
a
importa
tfootballmatch
Athis
Bthat
Cthere
Dit
3
isafactthatE
glishisbei
gacceptedasa
i
ter
atio
alla
guage
NMET1995
AThere
BThis
CThat
DIt
4Is

ecessarytotakeoffourshoeswhe
wee
terthelabMET88
Aeveryo
e
Bthis
Cher
Dit
5________willtakeyoualotoftimetofi
dhimi
thecrowd
AIt
BI
CWe
DThey
6Itis
ousehis_________therethesituatio
ishopeless
ow
AtogoBtobegoi
gCgoi
gDhavi
ggo
e
7Itis
evertoolatetolear
________
Aisit
Bis
’titCdoesitDdoes
’tit
8___________isk
ow
toallthatShe
zhouVILau
chedSuccessfully
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CIt
DThat
9_______isreportedi
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ewr