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“It”句型一直是近几年NMET命题的热点，同时也是日常教与学的重点和难点。在教材和练习中频频出现，由于其繁杂多变，尤其是一些近似句型的辨析，常使同学们望而却步。笔者在平时的教学中，注意收集这样的句子，现将这些句子分类整理并作一简析，希望能对同学们的学习有所帮助。
1．①It is 3 years ________ he joined the army.
②It will be 3 years ________ we meet again.
③Tom told me that it was 3 years ________ he had left school.
A.before
B.after
C.since
D.when
析：①C，②A，③C。做这类题目应从时态入手。句①是一个主从复合句，该句型常是：It+is（has been）+some time+since sb.did sth.主句用一般现在时或现在完成时，而从句则用一般过去时。句②为It will be （was）+some time before sb.does（did） sth.“多久某人干…”。主句要用一般将来时或一般过去时，before引导的从句则用对应的 一般现在时或一般过去时。又如：
It wasn’t long before we met again.
不久我们又见面了。
句③与句①是同一句型，只不过该句型出现在told引导的宾语从句之中了，故用了was和 had left 的形式。
2.①________ is wellknown to us all that the earth is round.
②________ is wellknown to us all,the earth is round.
A.That
B.As
C.It
D.Which
析：①C，②B。句①中it是形式主语，真正的主语是从句“that the earth is round ”。句②中as引导一非限制性定语从句，代替后面整句内容，置于句首。
3.①Was it the house ________ Abraham Lincoln was born?
②Was it in the house ________ Abraham Lincoln was born?
A.that
B.where
C.which
D.both A and B
析：①B，②A。句①的先行词是the house,后面为一个定语从句，所以可填where或in which。句②为强调句型。判断一个句子是否是强调句型，先把it is…that…这一结构抛开，看其余部分能否构成一个完整的句子。那么，句①还原为Abraham Lincoln was born the house.the house之前缺少介词in，故不为强调句了。句②则相符，故选that。
4.①It’s very kind ________ you to help us.
②It’s very important ________ us to keep the balance of nature.
A.for
B.of
C.to
D.with
析：①B，②A。在句①中，常见的形容词有kind,good,nice,foolish,stupid,wrong,clever 等。他们用来修饰人，表示人物的品质或性格特征。句①可变为You’re very kind to help us.所以选B。而句②则不可，因其形容词只能修饰后面的不定式，故用for。
5.①________ no wonder that he has passed the exam.
②________ no need for you to wait here.
A.There being
B.It was
C.It is
D.There is
析：①C，②D。句①为“无怪…”之意，it为形式主语，that从句为真正主语，该句型还常以No wonder…，Small wonder…或Little wonder…等省略形式出现。又如：No wonder he was punished by his father。句②为固定句型，多为否定句或疑问句。又如：Is there any need to explain further?有必要更进一步说明吗?
6.①It is strange that he ________ the work in 3 days.
②It is possible that he ________ the work in 3 days.
A.can finish
B.is finishing
C.should finish
D.finish
析：①C，②A。在it is necessary（important,strange,natural）等结构的句子中，其后的主语从句用虚拟语气，结构为“should+动词原形”。
7.①It is （high） time that we ________ to school.
②It is the second time that we ________ to Beijing.
A.go ……
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