it的所有用法总结如下：
①It + be + adj(kind , wise , careless, clever…) + of sb to do sth
Eg: It is wise of him to make such a decision他做出这样的决定是明智的。
②It + be + adj(easy , safe , common , normal …)+ for sb to do sth
该句型中adj若为important, necessary, natural, possible, strange, vital, essential等可改为从句,从句用should+动词原形。
Eg: It’s very dangerous for children to play with fire
It is important for us to learn English well (= It is important that we (should) learn English well)
③ It + be +V-ed(reported,believed, said, suggested…)+ that 从句
该句型中：⑴若V-ed为reported, believed, said等常译为“据报道”，“据认为”，“据说”。⑵若V-ed为suggested, ordered, demanded, insisted等表示“建议”,“命令”的词，从句要用虚拟语气(should)+动词原形。
Eg: It is suggested that the book (should) be revised
It’s said that Tom has been back from abroad (=Tom is said to have been back from abroad)
④ It + be + n (a pity, a shame, a fact , good news…)+ that 从句:
该句型中，从句一般用(should) + 动词原形，表示出乎意料，常译为＂竟然＂。
Eg: It is a pity that such a thing ( should ) happen in your class 这种事竟然发生在你们班上，真是遗憾！
⑤ It is useless/no use/no good /pleasure+ doing sth
此句型中的it是形式主语, 其后的动名词短语是真正的主语,译为“做…没有用”。
Eg : It ‘s useless arguing with him further // It’s no use talking with him, because he won’t listen
⑥ It takes sb to do sth
该句型中it是形式主语，真正的宾语是to do sth，常译为＂做……要花费某人……＂。
Eg: It took thousands of people many years to build the Great Wall
II．It 作形式宾语的句型
1sb find/ believe/ think/ feel/ consider/ make + it +n/adj +to do或从句
该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6 指主句中常用的动词：think, believe, make, find, consider, feel；1 指的是形式宾语 it；2 指的是宾补的两种形式：形容词或名词；3 指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。
Eg: We think it our duty to clean our classroom every day
He felt it important learning English well
They found it difficult that they would finish their work in two days
2主语＋hate / dislike / love / like ＋it ＋when－从句
Eg: I hate it when people speak with their mouths full
3 主语＋appreciate ＋it ＋if－从句
Eg: I really appreciate it if you could help me with my math
4 sb depend on/count on/rely on/see to(负责，确保)/ answer for it that…
Eg: You may rely on it that he won’t be late
You must see to it that the doors are locked before you leave the lab
5 sb take it for granted that… 认为……是理所当然的
Eg: I take it for granted that he will succeed
IIIIt 引导的时间句型
⑴ It + is/has been+ 时间段+ since引导的时间状语从句:
该句型中从句一般用过去时态，句意为“自从以来已多久了”
Eg : It is 5 minutes since the bus left 公汽开走已有5分钟了
⑵ It + be（will/was）+ 时间段 + before引导的时间状语从句:
该句型中，主句谓语动词be若为肯定式，意为“过多久才”；若为否定式时，意为“没过多久就”。
Eg : It will be long/ 3 hours before he comes back要过三个小时他才会回来
It was 3 hours before he came back 过了三个小时他才回来
⑶ It + be + 时间点+ when引导的时间状语从句
这个句型中, it 代指时间，表示时间点的词前没有介词。
Eg : It will be Monday when he comes back 他周一的时候回来
It was Monday when he came back 他周一回来的
对比：It was on Monday that he came back (强调句)
⑷ It + is (about/high) time + (that) sb did/should dosth
意为“该是某人做…的时候了”， about/high是用于加强语气，that从句用should或动词一般过去时表虚拟。
亦可转换成 It + is+ time +(for sb )to do sth
Eg : It’s (high/about) time (that) we handed in/should hand in our homework
⑸ It / This / That +is+ the first(second …) time + that sb has done sth:
意为“这是某人第…次做…”，注意time前有序数词，主句是 is 时 ，从句要用现在完成时；如果主句用was ，则从句须用过去完成时。 Eg : It is the third time that I have seen the film
That was the second time that I have been there
IV．It 引导的强调句
强调句形式：It + is/was +被强调的部分+ that/who从句
Eg: It was last week that I met an old friend in the street // It was because he was ill that he didn't come to school yesterday
(强调原因状语从句时，只能强调由because所引导的从句)
判断方法：将It is/was和that去掉，若该句是一个完整无缺的句子即为强调句
常考考点：
①强调句型中的主谓一致Eg: It is you，rather than he，that are to blame for the accident．
②插入从句的强调句型 Eg: It was in the restaurant where we had dinner last Sunday that you left your wallet．
③强调句型的一般疑问句、特殊疑问句形式
一般疑问句：Is / Was it + 被强调部分+ that + 句子其余部分 Eg: Was it in 1933 that the Second World War broke out
特殊疑问句：疑问词+ be + it + that + 句子其余部分Eg: When was it that he changed his mind to take part in the activity？
④强调句型用于名词性从句, 尤其注意要使用陈述语序。
Eg: I don’t know when it was that he changed his mind to take part in the activity？
⑤not until用于强调句型 It is / was not until ＋被强调部分＋ that ＋其他部分
Eg : It was not until midnight that she went back home
此句型只用until，不用till。但如果不是强调句型，till和until可通用。因为句型中It is / was not已经是否定句了，that后面的从句要用肯定句。
V．It其他常见用法：
It looks / appears as if 看起来好像……It looks as if she is ill
It seems that 似乎…… It seems that he will be back in a few days
It turns out that 原来是…… It turned out that the beautiful woman was a thief
It occurs to/strikes sb that… 突然想到……It occurred to me that I hadn’t locked the door
It happened that 碰巧…… It happened that he met his teacher in the street
It doesn’t matter whether/if…无论是…没关系 It doesn’t matter whether he will come or not
It is no wonder that 难怪… He works so hard It’s no wonder he could pass the exam
How did it come about that … “……怎么发生的？” How did it come about that his bike was thrown into the river
It all depends/that all depends那得看情况
It's up to sb由……决定，由……负责，取决于……
as it is (1)事实上，实际情况是……; (2)照原样
make it成功、做到、说定
Believe it or not信不信由你
Get it 明白了
it is cloudy today
what a lovely baby it is!(说明一下，婴儿性别一般不清楚的情况下用代词it)
it is five miles away from my home to school
it is at school where I found him
it is in this park where he picked up the wallet
it is useless to speak without action
it is easy to learn English
I find it necessary to learn Politcs
who is knocking at the door it is my cousin
it seems to rain
it seems that he is a foriegner
it is too dirty here
it is bad to tell him this matter
it is our responsibility to help them
it is 1949 when the PLC is founded
it is Liping who I invited
it is my fault
it is abvious that you are wrong
it is good of you to invite me
it is smart of him to solve the question
“It” 用法及其句型和固定搭配，是英语语法的重点、难点，又是近几年考试的热点，因此在复习中应给予足够的重视。现将it用法归纳如下：
一、It用作实词
表达以下概念:指代前文提到的事物，前文中的this, that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象。
二、It用作形式主语
替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。
It 作形式主语的常见句型：1 代作主语的动词不定式，其句型为（1）It be adj (for sb) to do sth
（2）It be adj of sb to do sth
（3）It替代作主语的动名词的常见句型：
It’s no good/use doing…
It’s (well)worth doing…
It’s (well)worth one’s while doing/to do It’s (well)worth while doing/ to do
2 It替代作主语的从句常见句型
（1）It is + noun +从句
（2）It is adj +clause
It’s surprising that… (should)………竟然……
It’s a pity/shame that…(should)………竟然…
（3）It verb sb + clause= It is v-ing + clause
It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb that…
（4）It verb (to sb) that…= sb/sth verb to do
(verb = appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out , work out)
（5）It is v-ed that…=sb/sth is to do
(verb=say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know）
四、It 作形式宾语
用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。
It 作形式宾语的常见句型：
1 verb+ it+ adj/noun (for/of) to do/clause (verb=think, believe, suppose, consider, feel, make, keep…)
五、强调句型
It is/was+被强调部分+ that(who)… 强调句型用来强调谓语动词以外的任何句子成分。当被强调部分是人时也可以用who。
在使用强调句型时需注意以下几点：
1 请注意强调句型的特殊疑问句
2 在强调原因状语从句时，只能强调由because所引导的从句。
3 在强调not … until结构时必须把not与until一起放到被强调的位置上。
4 注意强调句型与定语从句的区别。
六、It 常用的固定搭配
1 make it
(1)在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达 。
更详细的请看：）~~
>
以下是我为大家整理的it 的用法 总结 ，希望能帮助大家更好地认识it这个单词，提高英语水平。
1 It is + 被强调部分 + that
该句型是强调句型。将被强调的部分放在前面， 其它 部分置于that之后。被强调部分可以是主语，宾语，表语或状语。强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的 句子 。这也是判断强调句型与其它从句的 方法 。
It was about 600 years ago that the first clock with a face and an hour hand was made
It was they that (who ) cleaned the classroom yesterday
It was in the street that I met her father
2 It is clear ( obvious, true, possible, certain) that
该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为"清楚(显然，真的，肯定)" 是主语从句最常见的一种结构。
It is very clear that he’s round and tall like a tree
= That he’s round and tall like a tree is very clear
3 It is important ( necessary, right, strange, natural) that
该句型和上一个同属一个句型。由于主句中的形容词不同，that 后的从句中要用虚拟语气(should + 动词原形)，should 可以省去。建议记住该句型中的形容词。
It is important that we (should) learn English well
It is necessary that he (should) remember these words
4 It is not until + 被强调部分 + that
该句型也是强调句型。主要用于强凋时间状语，译成汉语"直到才"，可以说是 not until 的强调形式。
It was not until she took off her dark glasses that I realized she was a famous film star
= Not until she took off her dark glasses did I realize she was a famous film star
= I didn’t realize she was a famous film star until she took off her dark glasses
5 It is said (reported, learned) that
该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为"据说(据报道，据悉)"。
It is said that he has come to Beijing
It is reported that another earth satellite has been put into orbit
6 It is suggested ( ordered ) that
该句型和上一个同属一个句型。主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气(should + 动词原形)，should 可以省。常译为"据建议;有命令)
It is suggested that the meeting ( should ) be put off
It was ordered that we ( should ) arrive there in two hours
7 It is a pity ( a shame ) that
该句型中，that后的从句一般用虚拟语气(should + 动词原形)，should可省去表示出乎意料，常译为"竟然"。没有这种意义时，则不用虚拟语气。
It is a pity that such a thing ( should ) happen in your class
这种事竟然发生在你们班上，真是遗憾!
It is a pity that he is ill 他生病了，真遗憾!
8 It is time ( about time ,high time ) that
该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟② 有时也用should + 动词原形，should 不能省。常译为"是(正是)的时侯"。
It is time that children should go to bed
= It is time that children went to bed
9 It is the first ( second ) time that
该句型要和上一个句型区别开来。该句型中的 that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态;如果是一般过去时，后面从句则用过去完成时态。该结构中 that 可以省去;it有时用 this 替换常译为"是第一(二)次"。
It is the first time I have been here
= This is the first time I have been here
10 It is since
该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题。主句中是时间作表语，其时态是现在时或完成时，since 引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。
It is ( has been ) 5 years since his father died
11 It is when
该句型中的 when 引导的是一个时间状语从句，主句中的 it 指时间，表语由具体的时间充当。常译为"当的时候，是"。
It was 5 o’clock when he came here
12 It be before
该句型主句中的 it 指时间, 主句中的时态常是将来一般时或过去时两种时态主句中的表语多是long, not long , 3 days , 2 weeks 等表示时间段的词或 短语 。常译为"之后"。
It was 3 days before he went to Beijing
It will be not long before he finishes his job
13 It happens (seems, looks, appears ) that
该句型中it是形式主语，that 引导的是主语从句，主句中的happen , seem等词是不及物动词
It happened ( so happened ) that he met his teacher in the street 碰巧
It seems that he will be back in a few days 看来
14 It takes sb to do sth
该句型中的不定式是真正的主语，it是形式主语，句型中的直接宾语是时间。常译为"做要花费某人"。
It took thousands of people many years to build the Great Wall
15 It is no good (use ) doing sth
该句型中的真正主语是动名词短语，主句中的表语可以是no good , ( not any good ) , no use , ( not any use )。
It is no good learning English without speaking English
16 It doesn’t matter whether ( if )
该句型中whether(if) 引导的从句是真正主语，该句型常译为 "不论(是否)没关系。
It doesn’t matter if they are old
17 It is kind ( of sb ) to do sth
该句型中的不定式短语是真正主语，如果不定式的逻辑主语是由 of引起，主句中的形容词必须是能表示逻辑主语特征的形容词。常见的有： bad , brave , careless, clever , cruel , foolish , good (好心的), honest , horrible , kind , lazy , modest , naughty , nice(有教养的), polite, rude , silly , stupid , wise , wrong(错误的)等。 这个句型可以改写为：sb is kind to do sth
It is kind of you to say so
= You are kind to say so
18 It is necessary ( for sb ) to do sth
该句型与上一个同属一个句型。如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。常见的形容词有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。
在①中的形容词作表语可以用从句改写， 如：
It is important for her to come to the party
= It is important that she (should ) come to the party
19 It looks ( seems ) as if
该句型中it无意义。 as if 引导一个状语从句。常译为，"看起来好象"如果与事实不相符合，则用虚拟语气
It looks as if he is ill(真的病了)
It looks as if he were ill (没有生病)
It seemed as if he were dying
20 We think it important to learn a foreign language
该句型中的it 作形式宾语。为了记忆方便我们可称该句型为"6123结构"。
6指主句中常用的动词：think, believe, make, find, consider, feel;
1指的是形式宾语it;
2指的是宾补的两种形式：形容词或名词;
3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。
We think it our duty to clean our classroom every day
He felt it important learning English well
They found it difficult that they would finish their work in two days
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1 陈述句的强调句，强调陈述句中的某个成分。
为了强调句子中的有些成分，要用强调结构It is（was）+被强调部分+that（who）+其他部分。被强调的成分可以是主语、宾语、状语，但不能是定语表语和谓语。这种类型的强调句主要注意一下几个方面：
1）It在这一结构中作主句的主语，所以即使被强调部分是复数名词，也要用is或was
eg Tom and Mark often come to see me
It is Tom and Mark Who often come to see me （强调主语）
2）如果被强调部分是时间、地点、方式或原因也不用when， where， how， why， 而用that；强调人时可用who，也可用that
eg（1）They set out the day before yesterday
It was the day before yesterday that they set out （强调时间状语）
（2）We put off the sports meet because of the rain
It was because of the rain that we put off the sports meet（强调原因状语）
（3）It was because she was ill that they didn‘t ask her to do the job （强调原因状语从句）
3）被强调部分如果是原句的主语，who或that后面谓语的人称和数应和原句的主语一致。
— Personally， I think it is the salesmanager， rather than the salesgirls， ____ to blame
—I agree with you
A is B that is C are D who are
2 一般疑问句的强调句，只需把is（was）提前。
eg （1） Was it in 1939 that the Second World War broke out？
（2） Is it Professor Wang who teaches you English？
（3） —Was it two months ago _____ you luckily got an opportunity to spend your holiday in Canada？
— _____ John was the lucky dog……
A when； Not I B when； Not only C that； Not all D that； Not me
3特殊疑问句的强调句，强调特殊疑问句中的疑问词。
eg （1） Where did you find the wallet？
Where was it that you found the wallet
（2） When shall we meet？
When is it that we shall meet？
从上面的例子中我们可以看出，特殊疑问句的强调句是由“特殊疑问词+was（is） it that +陈述句”构成的。但是当含有特殊疑问词的强调句型用在宾语从句中的时候，上述句型应改为‘特殊疑问词+it was（ is） that +陈述句“，即采用陈述句语序。
eg （1） — where was it ____ the road accident happened yesterday？
— In front of the market
A when B that C which D how
（2） I really don‘t know _____ you returned the book to me
A when it was that B when was it C when was it that D when it was
4 有时可用It might be ……that ……，和It must have been……that……的句型表示强调。
eg （1）It might be his father that you are looking for
（2）It must have been his brother that you met
5 强调not……until结构中由until引导的短语（或从句）表示时间状语的句型是：It is（was） not until……+that……+其他部分。
eg 1）He didn‘t marry until forty
It was not until forty that he married
（2）Mr Yang did not leave the lab until he got everything ready for the experiment
It was not until he had got everything ready for the experiment that Mr Yang left the lab
（3）_____ he realized it was too late to return home
A Not until dark B It was until dark that C It was not until dark that D It was dark that注意：如果not……until放在句首时就要用部分倒装句式，它的语序和在not……until结构中由until引导的短语（或从句）表示时间状语的句型中的语序不同。
6 强调词it与先行词it的区别。
强调词it与先行词it的区别可以通过恢复原句的方式来判断，即如果把it is……that……去掉后剩下的成分仍然能组成一个完整的句子，这就是强调句型，否则就不是。
It is there that accidents often happen
→ Accidents often happen there
以上就是强调句型，被强调成分是状语，把it is……that……去掉，还原成后来的非强调句。
It is clear that not all boys like football
上面的句子如果去掉it is……that……后就成了Clear not all the boys like football很显然这不是一个完整的句子，因此不是强调句型，而是由it作先行词引导的一个主语从句。
7 其他的一些强调句型：
It is/was+时间段+since从句，It +时间段+before从句，It is/was+时间点+when从句。
1）It is/was + 时间 + since …，从……已多久了。在这个句型中，主句通常用一般现在时，since从句用过去时，表示一个时间点。
eg（1）It is five months since I arrived in New York 我到纽约已五个月了。
（2）It is five months since I was in New York我离开纽约已经五个月了。
注意：例句中five months是作为一个整体看待的，所以用it is在这类句子中，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，则从动作或状态结束时算起。
2）It is + 时间+ before …。在这个句型和上面一个句型中，时间都是时间段，如years，five days，twenty minutes等。不过主句的时态多用一般将来时或一般过去时，从句的时态要根据主句的时态进行变化。Before前的主句如果是肯定的，翻译成“在……之后才……” 主句如果是否定的，翻译成“不久就……”
eg（1）It was long before he gave an answer
过了好久他才答复我。
（2）It was not long before he worked out the difficult maths problem
不一会儿他就把那道数学题解出来了。
（3）It will be years before he comes back
过几年他才回来。
（4）It was five o‘clock A he came to see me
It was at five o‘clock B he came to see me
It is five years D I left school
It was five years C he joined the army
A when B that C before D since
3）It was + 时间 +when从句在上述句型中it指时间，when引导的是时间状语从句
eg（1）It was at midnight that I got back home yesterday
（2）It was midnight when I got back home yesterday
第一句是强调句型，被强调的时时间状语，因此用介词短语表达，而第二句是一般句型，时间以名词的方式表达，用来作表语。
二、谓语动词的强调
it is……that……结构不能强调谓语，如果需要强调谓语，用助动词do， did或does如：
Do come here tomorrow
He did write to you last week
Mary does study hard now
想做英语的练习题的话我建议你可以去我要模考网看看，上面的题型挺全的
it的用法
(1)it作无人称代词：it作无人称代词表示自然现象、气候、时间、距离等it是形式主语没有词汇意义如： 1)It is very cold today．(气候) 2)It is three o'clock．(时间) 3)It is along way from here．(距离)
(2)it作人称代词：it作人称代词时,用来代替上下文中提到的事或物,有时可代替整个句子的内容
(3)his(was)+形容词十不定式(to do),it为形式主语,不定式短语为真正主语 (过去分词)
(4)his+{形容词}+that(what,how,whether．．．),it为形式主语,that引导的为主语从句 (名词)
(5)It+不及物谓语动词+that引导的主语从句这些动词有：seem,appear,turn out,follow,happen等
(6)It may well be that引导的主语从句
(7)it作形式宾语： 1)某些及物动词+it+形容词十不定式； 2)某些及物动词+it+形容词+that 在上述两种句型中,it是形式宾语,真正的宾语是不定式短语,或that引导的宾语从句
(8)it用于强调句型： It is(was)十被强调的成分+that(which,who) 强调句型是简单句,可以用来强调句中主语、宾语和状语,但不能强调定语和谓语在这种句型中把his．．．that去掉,句子仍成立 代词在句中分析与翻译的
1、it的基本用法
（1）用作人称代词，代替前文提到过的事物。
The train has arrived It arrived half an hour ago
（2）用以代替提示代词this, that。
—What’s this —It’s a knife
—Whose watch is that —It’s mine
（3）起指示代词的作用，指一个人或事物。
—Who is knocking at the door —It’s me
（4）指环境情况等。
It was very noisy (quiet) at the very moment
（5）指时间、季节等。
—What time is it —It’s eight o’clock
It often rains in summer here
（6）指距离。
It is a long way to the school
（7）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 didn’t read the book
（8）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。
It was Xiaoming whom(that)I met in the street last night
It was in the street that I met Xiaoming last night
It ws last night that I met Xiaoming in the street
It was I who met Xiaoming in the street last night
2、含有“It is …”的句型
（1）It is time (for sb) to do sth
It is (high) time that sb did sth(虚拟语气)
（2）It is + 形容词（+of / for sb）+ to do sth
通常用
of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。
（3）It is + 形容词 + that + sb + (should) do sth（虚拟语气）
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should而直接用动词原形。如：
It is important that we should pay close attention to grain
It is natural that he（should）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 + 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 brother is going to
work（注意上述各句均为强调句型的“考点”）
比较：It is a small factory where my brother is going to
work（定语从句）
（6）It is said/reported/announced/ (well) known … that…
（7）It is/was + 时间 + since … 从……已多久了。
It is three years since I met him in Beijing
It was a long time since I (had) lived in that small mountain
village with these farmers（注意两句中的时态）
It is five months since I arrived in New York我到纽约已经五个月了。
It is five months since I was in New York我离开纽约已经五个月了。
（注意：终止性动词表示从动作发生时算起；如果是状态动词或持续性动词，则从动作或状态结束时算起。）
（8）It is + 时间 + before …
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。
It was not long before they set out for the front
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 seen the film
（10）It is up to sb to do sth … 应由某人做某事。
It is up to you to decide whether we start or not
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