“It”句型一直是近幾年NMET命題的熱點(diǎn)，同時(shí)也是日常教與學(xué)的重點(diǎn)和難點(diǎn)。在教材和練習中頻頻出現，由于其繁雜多變，尤其是一些近似句型的辨析，常使同學(xué)們望而卻步。筆者在平時(shí)的教學(xué)中，注意收集這樣的句子，現將這些句子分類(lèi)整理并作一簡(jiǎn)析，希望能對同學(xué)們的學(xué)習有所幫助。
1．①I(mǎi)t is 3 years ________ he joined the army.
?、贗t will be 3 years ________ we meet again.
?、跿om told me that it was 3 years ________ he had left school.
A.before
B.after
C.since
D.when
析：①C，②A(yíng)，③C。做這類(lèi)題目應從時(shí)態(tài)入手。句①是一個(gè)主從復合句，該句型常是：It+is（has been）+some time+since sb.did sth.主句用一般現在時(shí)或現在完成時(shí)，而從句則用一般過(guò)去時(shí)。句②為It will be （was）+some time before sb.does（did） sth.“多久某人干…”。主句要用一般將來(lái)時(shí)或一般過(guò)去時(shí)，before引導的從句則用對應的 一般現在時(shí)或一般過(guò)去時(shí)。又如：
It wasn’t long before we met again.
不久我們又見(jiàn)面了。
句③與句①是同一句型，只不過(guò)該句型出現在told引導的賓語(yǔ)從句之中了，故用了was和 had left 的形式。
2.①________ is wellknown to us all that the earth is round.
?、赺_______ is wellknown to us all,the earth is round.
A.That
B.As
C.It
D.Which
析：①C，②B。句①中it是形式主語(yǔ)，真正的主語(yǔ)是從句“that the earth is round ”。句②中as引導一非限制性定語(yǔ)從句，代替后面整句內容，置于句首。
3.①Was it the house ________ Abraham Lincoln was born?
?、赪as it in the house ________ Abraham Lincoln was born?
A.that
B.where
C.which
D.both A and B
析：①B，②A(yíng)。句①的先行詞是the house,后面為一個(gè)定語(yǔ)從句，所以可填where或in which。句②為強調句型。判斷一個(gè)句子是否是強調句型，先把it is…that…這一結構拋開(kāi)，看其余部分能否構成一個(gè)完整的句子。那么，句①還原為Abraham Lincoln was born the house.the house之前缺少介詞in，故不為強調句了。句②則相符，故選that。
4.①I(mǎi)t’s very kind ________ you to help us.
?、贗t’s very important ________ us to keep the balance of nature.
A.for
B.of
C.to
D.with
析：①B，②A(yíng)。在句①中，常見(jiàn)的形容詞有kind,good,nice,foolish,stupid,wrong,clever 等。他們用來(lái)修飾人，表示人物的品質(zhì)或性格特征。句①可變?yōu)閅ou’re very kind to help us.所以選B。而句②則不可，因其形容詞只能修飾后面的不定式，故用for。
5.①________ no wonder that he has passed the exam.
?、赺_______ no need for you to wait here.
A.There being
B.It was
C.It is
D.There is
析：①C，②D。句①為“無(wú)怪…”之意，it為形式主語(yǔ)，that從句為真正主語(yǔ)，該句型還常以No wonder…，Small wonder…或Little wonder…等省略形式出現。又如：No wonder he was punished by his father。句②為固定句型，多為否定句或疑問(wèn)句。又如：Is there any need to explain further?有必要更進(jìn)一步說(shuō)明嗎?
6.①I(mǎi)t is strange that he ________ the work in 3 days.
?、贗t is possible that he ________ the work in 3 days.
A.can finish
B.is finishing
C.should finish
D.finish
析：①C，②A(yíng)。在it is necessary（important,strange,natural）等結構的句子中，其后的主語(yǔ)從句用虛擬語(yǔ)氣，結構為“should+動(dòng)詞原形”。
7.①I(mǎi)t is （high） time that we ________ to school.
?、贗t is the second time that we ________ to Beijing.
A.go
B.went
C.have been
D.have gone
析：①B，②C。句①為It is （high）time 引導的定語(yǔ)從句，應用虛擬語(yǔ)氣，其結構為“過(guò)去式或should+動(dòng)詞原形”，should不可省略。句②的先行詞time由序數詞修飾，從句要用完成時(shí)態(tài)，且時(shí)態(tài)要和主句保持一致。又如：
It （This/That）was the third time that he had been invited to our school.
It’ll be the fourth time that he’ll have been there.
8.①________ doesn’t matter much whether he’ll come to the party.
?、贗 feel ________ an honour to be invited to speak here.
A.this（This）
B.it（It）
C.that（That）
D.what（What）
析：①B，②B。在句①和句②中it分別作形式主語(yǔ)和形式賓語(yǔ)，故不能用this或that代替。
9.①I(mǎi)t’s no good ________ such a thing.
?、贗t’s of no importance ________ such a thing.
A.do
B.to do
C.doing
D.done
析：①C，②B。句①常用doing作真正的主語(yǔ)，故選C。類(lèi)似句型還有It’s no use （useless）crying over the spilt milk.句②則只能用不定式作真正主語(yǔ)。再如It’s important/helpful/good/necessary/possible/right/
wrong+to do…。
10.①I(mǎi)t is hoped that you ________ there on time.
②It is advised that you ________ there on time.
A.arrive
B.should arrive
C.will arrive
D.both A and B
析：①C，②D。句①是it作形式主語(yǔ)，that從句作真正的主語(yǔ)。主從句時(shí)態(tài)一致是解題的關(guān)鍵。類(lèi)似句型有：It’s said/believed/hoped/expected/reported/announced/whispered that…等等。做這類(lèi)題目時(shí)，還應注意其轉變題型。例如：
?。∟MET’99） Robert is said ________ abroad,but I don’t know what country he studied in.
A.to have studied
B.to study
C.to be studying
D.to have been studying
如果把首句變?yōu)镮t is said that Robert ________,再結合后面的“studied”便可輕易得出答案A。
句②It is advised that…=sb.advises that,所以仍需用虛擬語(yǔ)氣，謂語(yǔ)動(dòng)詞為should do或do的形式。類(lèi)似的句型還有It is insisted/ordered/suggested/demanded/required /requested that…等等。
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