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1、1、it的基本用法的基本用法（1）用作人称代词，代替前文提到过的事）用作人称代词，代替前文提到过的事物。物。The train has arrived. It arrived half an hour ago.（2）用以代替提示代词）用以代替提示代词this, that。Whats this? Its a knife.Whose watch is that? Its mine.（3）起指示代词的作用，指一个人或事物。）起指示代词的作用，指一个人或事物。Who is knocking at the door? Its me.（4）指环境情况等。）指环境情况等。It was very noisy
2、(quiet) at the very moment.（5）指时间、季节等。）指时间、季节等。What time is it? Its eight oclock.It often rains in summer here.（6）指距离。）指距离。It is a long way to the school.（7）作形式主语。）作形式主语。It is not easy to finish the work in two days.It is no use crying over spilt milk.It is as pity that you didnt read the book.（8）作形
3、式宾语。）作形式宾语。I think it no use arguing with him.I found it very interesting to study English.He made it clear that he was not interested in that subject.（9）用于强调结构。）用于强调结构。It was Xiaoming whom(that)I met in the street last night.It was in the street that I met Xiaoming last night.It was I who met Xiaom
4、ing in the street last night.2、含有、含有“It is ”的句型的句型（1）It is time (for sb.) to do sth.It is (high) time that sb. did sth.(虚拟语气虚拟语气)（2）It is + 形容词（形容词（+of / for sb.）+ to do sth.通常用通常用 of的词有的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。等。（3）It is + 形容词形容词 + that + sb
5、. + (should) do sth.（虚拟语气）（虚拟语气）能用于这个句型的形容词有能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去等。有时可省去should而直接用动而直接用动词原形。词原形。 It is important that we should pay close attention to grain.It is natural that he（shou
6、ld）say so.（4）It is no use/ good + doing sth.It is no use trying again = It is of no use to try again.（5）It is + 被强调部分被强调部分 + that/who + Was it in the street that you met her?Who was it that called him“comrade”?It was not until yesterday that I met my old friend.It is in a small factory that my broth
7、er is going to work.（注意上述各句均为强调句型的（注意上述各句均为强调句型的“考点考点”）比较：比较：It is a small factory where my brother is going to work.（定语从句）（定语从句）（6）It is said/reported/announced/ (well) known that（7）It is/was + 时间时间 + since 从从已多久了。已多久了。It is five months since I arrived in New York.我到我到纽约已经五个月了。纽约已经五个月了。It is five m
8、onths since I was in New York.我离开纽我离开纽约已经五个月了。约已经五个月了。（注意：终止性动词表示从动作发生时算起；如（注意：终止性动词表示从动作发生时算起；如果是状态动词或持续性动词，则从动作或状态结果是状态动词或持续性动词，则从动作或状态结束时算起。）束时算起。）（8）It is + 时间时间 + before 这个句型和上面句型中时间都是时间段，如这个句型和上面句型中时间都是时间段，如long、years、months、weeks、five days、three hours、twenty minutes等。不过主句的等。不过主句的时态多用一般将来时或一般过
9、去时。时态多用一般将来时或一般过去时。It will be several years before we meet again. 我们要过好几年才能再见面。我们要过好几年才能再见面。It was not long before they set out for the front.不久他们就出发去了前线。不久他们就出发去了前线。（9）It is /was/will be the first/second/third time that It is the first time that I have been here.It was the second time that he had s
10、een the film.（10）It is up to sb. to do sth 应由某人应由某人做某事。做某事。It is up to you to decide whether we start or not.解析：答案为解析：答案为D。本题考查作形式主。本题考查作形式主语的用法。语的用法。that引导的从句是真正的引导的从句是真正的主语。为避免头重脚轻而平衡句子结主语。为避免头重脚轻而平衡句子结构，将构，将it置于句首作形式主语。置于句首作形式主语。1. _ is a fact that English is being accepted as an international la
11、nguage. There B. This A. C. That D. It 2. I hope there are enough glasse for each guest to have _. A. it B. those C. them D. one解析：答案为解析：答案为D。本题考查替代词。本题考查替代词it和和one的的区别。区别。it用于替代同类的、特定的、同一的用于替代同类的、特定的、同一的事物；事物；one替代同类的、泛指的人或物。根替代同类的、泛指的人或物。根据题意据题意“我希望有足够的杯子使每个客人有我希望有足够的杯子使每个客人有一个。一个。”可知应用可知应用one泛指泛指enough glasses中中的一个。的一个。3. Was _ that I saw last night at the concert?A. it you B. not you C. you D. that yourself解析：答案为解析：答案为A。本题考查强调句。本题考查强调句型的疑问式。只须将句序变为陈型的疑问式。只须将句序变为陈述句便不难得出答案。述句便不难得出答案。