(完整版)It的几个特殊句型
it用作形式宾语的四个特殊句式
it用作形式宾语的四个特殊句式?当不定式、动名词、从句等复杂成分用作宾语且其后跟有宾语补足语时，通常会在宾语补足语前使用形式宾语it，而将真正的宾语移至句末，此时it仍只起先行引导作用，本身无词义。
其基本结构为“动词+it+宾语补足语+不定式(动名词或从句)”。
如：Ifinditdifficulttodothejobwell.我发现做好这件事不容易。
Ithinkitbestthatyoushouldstayhere.我认为你最好住这儿。
Wethinkitnousecomplaining.Hemakesitarulenevertoborrowmoney.Ithinkitnoneedtalkingaboutitwiththem.Hefeltitimportant?tolearn?Englishwell.能这样用的动词有：为"6123结构"。
6指主句中常用的动词：123考点）：1.动词据传闻，国防部长不久就要辞职。
等。
2.动词like,enjoy,love,hate，Wereallyappreciateitwhensheofferedtohelp.她来帮忙了，我们十分感激。
I’dpreferitifIdidn’thavetodo somuchwork.要是我不必做那么多工作，好就太好了。
3.动词+prep+it+that-从句。
that引导的宾语从句不能直接作介词的宾语。
如：Seetoitthatyou’renotlateagain.注意千万不要再迟到。
Looktoitthatthisdoesn’thappenagain.注意不要再发生这种事。
Ican’tanswerforitthathewillcome.我不能保证他会来。
Youmayrelyonitthathe’llcometomeetyou.你放心，他会来接你的。
Youmaydependonitthatweshallalwayshelpyou.（尽管放心，我们会随时帮你的。
it做主语的句型
IT 作为主语的句子类型主要包括以下几种：1. 一般陈述句：例如：IT is a beautiful day.（今天是个美好的一天。
）2. 疑问句：例如：What about IT?（怎么样？）3. 否定句：例如：IT isn't working.（它没在运作。
）4. 祈使句：例如：IT needs fixing.（它需要修理。
）5. 感叹句：例如：How amazing IT is!（多么惊人啊！）6. 一般疑问句：例如：Does IT work?（它运作吗？）7. 特殊疑问句：例如：Which IT do you mean?（你指的是哪个？）8. 选择疑问句：例如：Do you want IT or that one?（你要哪一个，这个还是那个？）9. 被动句：例如：IT is being repaired.（它正在被修理。
）10. 宾语从句：例如：I think IT is a good idea.（我认为这是个好主意。
）11. 状语从句：例如：However IT happens, we should be prepared. （无论怎样，我们都应该做好准备。
）12. 名词性从句：例如：IT is obvious that he is talented.（他很天赋。
）13. 条件句：例如：If IT rains, we will stay indoors.（如果下雨，我们就在室内活动。
）14. 虚拟语气：例如：What would IT be like if IT were summer? （如果现在是夏天，它会是什么样子？）15. 比较级和最高级：例如：IT is the best solution.（这是最好的解决方案。
）16. 倍数表达：例如：IT costs twice as much as that.（它的价格是那个的两倍。
）17. 并列句：例如：IT rains and snows simultaneously.（雨和雪同时下。
（完整版）It的用法总结
（完整版）It的用法总结It的用法总结在英语中,it有许多不同的用法,它既可以用作代词(如人称代词、非人称代词)，也可以用作引导词（作形式主语或形式宾语），还可以用来构成强调句型。
.it用作代词(1) 用作人称代词在句子中作主语或宾语；指前面已经提到过的事物、动物或人，且it指特定的事物；如果指前文中提到的事物中的任何一个，用one。
one可以与any, each, every, not等连用，但one 不可代替不可数名词。
—where’s your car?—it’s in the garage. 你的汽车在哪儿呢？在车库里。
(指代物品your car)did you hit it? 你打中了吗？ (指代事件)the baby cried when it was hungry.这婴儿饿时就哭。
（指代婴儿，尤指性别不详或无所谓时）—who is that?—it’s me. 是谁？我。
(指一定情景中所确定的人或事物，此时相当于指示代词，代指this和that,有时也指人)—what’s this?—it’s a box. 这是什么？一只箱子。
(2) 作非人称代词表示天气、日期、时间、温度、距离、价值、路程、度量、自然现象与环境等。
也可模糊地指一般情形或上文的部分或整个意思。
译成汉语时，it通常不一定译出来。
it’s a long time since they left. 他们走后很久了。
it’s two miles to the beach.离海滨有两英里远。
that’s just it—i can’t work when you’re making so much noise.原因就在这里——你弄出这么大的声音，我工作不了。
另外，需要注意两点：（1）“it’s time…”后面可以接不定式和介词短语表示“是做……的时候了”。
如：it’s time for supper. it’s time to have supper.(2) “it’s time…”后面还可以接一个从句，但是从句中的谓语动词一定要用过去式即虚拟语气，如：it’s time we had lunch.是我们吃饭的时候了。
(完整版)It作形式宾语用法总结
" It" 做形式宾语用法总结当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾，构成“动词＋it＋宾语补足语＋不定式（动名词或从句）”结构，也可称作“6123结构”。
此时it仍只起先行引导作用，本身无词义。
它可以代替三种形式：不定式、动名词和宾语从句。
it作形式宾语时，需具备两个条件：①真正的宾语是不定式、动名词或从句; ②有宾语补足语，具备了这两个条件，形式宾语it一定要用。
⒈ it代替不定式短语think/ find/ feel/ consider/ make/ regard…+ it +形容词/名词+ 不定式短语如：①I find it pleasant to work with him.(it 作形式宾语，代替不定式短语to work with him)②They felt it difficult to finish the work in such a short time.（it 作形式宾语，代替不定式短语to finish the work in such a short time）③She thinks it her duty to help us.（it 作形式宾语，代替不定式短语to help us）④I think it my honor to be invited to speak here.（it 作形式宾语，代替不定式短语to be invited to speak here）⑤Tom didn’t find it difficult to write letters i n Chinese.（it 作形式宾语，代替不定式短语to write letters in Chinese）⑥All these noises made it impossible for me to go on with the work.（it 作形式宾语，代替不定式短语to go on with the work）⒉ it代替动名词短语( 这只限于少数句型，在多数情况下用不定式时更多一些)如：①The professor considers it no good reading without understanding.②Do you consider it any good trying again?③He found it useless( no use) arguing with him.④He thought it absolutely senseless attempting the impossible.⑤I don’t think it worthwhile going to such a place.⒊ it代替宾语从句：如：①We all thought it a pity that the conference should have been cancelled.②I took it for granted that they were not coming.③I’ll see to it that everything is ready in time.“it”的特殊用法常出现在以下几种结构中。
it的特殊用法
it的特殊用法作者：inQ老师来源：本站原创适用年级：初中英语适用单元：全部一般情况下，it表示人以外的动物和东西，是单数名词的代词。
今天我们来说下it的一些特殊用法。
1、代指婴儿或照片、图画上的人物Look at the baby.It is asleep.看那个婴儿。
它在睡觉。
2、it作形式宾语：主语+动词+it+宾补+doing/to do sth在这个句型中，动词通常是consider, make, find, feel, think等。
当宾补是no good, no use ,useless 时，真正宾语须用动名词（也就是doing形式）；其他情况用动词不定式。
如：I think it no use telling him this matter.我认为没有必要告诉他这件事情。
They find it necessary to learn to be polite.他们发现学会讲礼貌很有必要。
3、用于引导强调句型It is/was+强调的部分+that/who/…It was not until she took off her dark glasses that I realized she was a famous film star.她摘下墨镜我才认出她是一个著名的电影明星。
It was on Sunday night that all this happened.所有这一切都是在星期日晚上发生的。
4、表示时间、季节、天气、距离、价格、重量It's six o'clock. 六点钟了。
It's winter now. 现在是冬天了。
It's rainy today.今天下雨了。
How far is it from school to your home? 学校到你家有多远？—How much is it?—多少钱？—It's five yuan.—五元钱。
it的9个常用特殊句型
含it的9个常用特殊句型1. It appears/ happens/ seems/ says that…It seems that he is always correct. 他好像总是对的。
It happened that I had no money with me. 碰巧我当时没有带钱。
2. It is said/ reported/ believed/ understood that…It is said that he has joined the Party. 据说他已经入党了。
3. It doesn’t matter…It doesn’t matter what he says. 他说什么都没关系。
4. (It is) no wonder( that) …It’s no wonder he is not hungry; he has been eating sweets all day. 难怪他不饿，他整天在吃糖果。
5.It is a waste of time /money doing sth.It’s a waste of time your talking to him. 你和他谈是浪费时间。
6. It makes no/mush difference…It’s doesn’t make much difference my being there. 我在不在那儿没有什么影响。
7. it takes sb. some time to do sth.It took me nearly an hour to work out the problem. 花了我差不多一个钟才做出那道题.8. It’s one’s turn to do sth.It’s my turn to clean the classroom. 是轮到我打扫教室的了。
9.If it were not for…If it were not for your help, I would still be homeless. 若不是你帮忙，我现在还是无家可归。
有关it 的几个特殊句型
有关it 的几个特殊句型（1）owe it to sb. that…把…归功于…I owe it to you that I finished my work in time.亏你帮忙，我才及时完成了工作。
（2）take it for granted that…理所当然…I take it for granted that they will support this idea.我认为他们会支持这个提议是理所当然的。
（3）keep it in mind that …It must be kept in mind that there is no secret of success but hard work一定要记住的是成功的秘密是努力的工作。
（4）It can be seen from the statistics that …从这个统计可以看出…I t can be seen form the statistics that exercise is good for us.从这个统计可以看出，练习对我们是有好处的。
（5）it 用在不能直接跟宾语从句的动词后面，尤其是表示好恶的动词后，enjoy ,like ,love ,dislike ,resent ,hate ,don’t mind ,be fond of ,feel like ,see to ,appreciate ,stand 宾语从句紧跟it 之后。
I hate it you can swim so well and I can’t.我嫉妒你游泳那么好，而我不能。
I would appreciate it if you call me back this evening.如果你今晚上给我回电话，我会非常感激。
I can’t stand it when people talk with their mouth full.我无法忍受别人说话的时候满嘴食物。
容易混淆的it的句型
3 It is/was+时间名词+when… (时间状语从句) 当我们到家时已是1点了. It was one o’clock when he got home. 4 It is/was +时间状语+that…(强调句) 我们是在1点回家的. It was at one o’clock that he got home. 5 It is the first time (that)… 我第一次到这来. It is the first time that I have been here. 6 It is time that….did/should do… 现在该是我们开始上课的时候了. It is time we began our class now.
容易混淆的it的句型归纳:
1 It is/has been+时间名词＋since ...did (时间状语从 句） 自从 … 以来,已是… 2 It is＋时间名词＋before… (时间状语从句） 要过…才… 3 It is/was+时间名词+when… 时间状语从句 当…时 4 It is/was +时间状语+that…(强调句) 5 It is the first time (that)…. 第一次… 6 It is time（ that）….did/should do… (定语从句） 该是… him in chess yesterday. It was the first time____ that I had won the game. that 8.Isn’t it time _____we took immediate action to fight against pollution now. 9.It is the very room ______I where used to study. that I used to study. 10.It was in the very room ____ that 11.It was at almost midnight ____he fell asleep. 12.It was almost midnight______ when he finished the work.
it形式主语句型
“it”在英语中经常用作形式主语，尤其是在主语从句中。
形式主语用于表示主语从句，即一个句子作为主语，而“it”是这个句子的形式主语。
以下是几个使用“it”作为形式主语的常见句型：
1. It is + 形容词+ that + 主语从句
例如：It is clear that he has made a mistake.
解释：在这个句型中，“it”是形式主语，“that”后的句子是真正的主语。
2. It is + 名词+ that + 主语从句
例如：It is a fact that the earth is round.
解释：这个句型与上一个相似，但形容词被替换为名词。
3. It + 动词+ 主语从句
例如：It happened that he was late for the meeting.
解释：在这个句型中，“it”是形式主语，动词是主语从句的谓语。
4. It + be + 时间/距离+ before + 主语从句
例如：It will be two years before we meet again.
解释：这个句型用于表示在某个时间或距离之后会发生某事。
5. It is/was + 被强调部分+ that + 主语从句
例如：It was yesterday that he met his friend.
解释：这个句型用于强调某个时间或部分。
这些只是使用“it”作为形式主语的一些常见句型。
在英语中，还有其他更复杂或特定的用法。
【英语】高考必考点：it的固定句式集锦
【英语】高考必考点：it的固定句式集锦第一，it作形式主语的常见句型(1)it替代动词不定式的常见句型为：①It+ be+ adj+ (for sb.) to do sth.此处的形容词通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible等。
如：It is illegal for a teenager to drive a car without a license.②It +be+ adj.+of sb. to do sth.此处的形容词通常为描述人的形容词：kind, unkind, nice, rude, cruel等。
如：It’s kind of you to help me with the problem.(2)it替代动词-ing的常见句型：It’s no good/use doing...It’s (well) worth doing...如：It’s no use crying over spilt milk.(3)it替代从句的常见句型：①It +be+n.+that从句如：It is no secret that the president wants to have a second term in office.②It +be+adj.（important, necessary, surprising...）+that从句从句中的谓语动词用"should+动词原形"形式，且should可省略。
如：It’s important that you should apologize to her for yourrudeness.③It +v.+sb.+that从句= It +be+ v-ing +that从句如：It worried me that she drove so fast.(= It was worrying that she drove so fast.)④It+v.(+to sb.)+ that从句常用动词或短语有appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out, work out等。
it句型归纳总结大全
it句型归纳总结大全"it"句型是英语中常见的一种句型结构，通常用来强调或者指代特定的事物或情况。
下面是对"it"句型的归纳总结：1. 强调句型：It is (was) + 被强调的部分 + that/who + 其余部分。
例，It is the book that I want to read.（我想读的就是这本书。
）。
例，It was Mary who broke the window.（打破窗户的是玛丽。
）。
2. 虚主语句型：It + be + 形容词 + to do.例，It is important to learn English well.（学好英语很重要。
）。
3. 虚宾句型：It + be + 名词 + to do.例，I find it a pleasure to work with you.（我觉得和你一起工作很愉快。
）。
4. 指代句型：It + be + 形容词 + (for sb.) + to do sth.例，It is easy for me to solve the problem.（对我来说解决这个问题很容易。
）。
5. 天气句型：It + be + adj. + (for sb.) + to do sth.例，It is hot for us to go out.（对我们来说出去很热。
）。
6. 距离句型：It + be + 距离 + to + 地点。
例，It is five kilometers to the station.（离车站还有五公里。
）。
以上是对"it"句型的归纳总结，希望对你有所帮助。
如果你还有其他问题，欢迎继续提问。
初三英语语法it句型结构
(4) 常考: sb. find/ think/ make it + adj. + (for/ of sb.) + to do sth. (5) 常考：It is/was + 被强调部分 + that/who + 其他部分
【例题】
1. Wearing the soft coat ___________ (make) me feel___________ (good) to sit in the classroom. 答案：makes; good 解析：做这类填空题，拿分不难，但是要对所考查的句型背诵熟悉。wearing the soft coat 是动词 ing 词组做 主语，此时谓语动词要用三单，所以第一空填写为 makes; 其次，feel 是感官系动词，后面要接形容词，所 以填 good. 整个句型就是 Doing sth. makes sb. feel + adj. 2. It’s terrible_________ me to do work __________ __________ (不讲话) all day. 答案：for; without speaking 解析：句子中的 it’s=it is, terrible 是形容词，可知考查句型 It is + adj. of/for sb. to do sth.；注意介词 for 和 of
it的用法总结经典句型
it的用法总结经典句型1. “It’s time to do something”（是做某事的时候了）。
比如说：“It’s time to hit the sack!（是该睡觉的时候啦！）”，这就像是火车到了站点，该行动啦！2. “It takes somebody some time to do something”（某人花费多少时间做某事）。
像“ It took her a whole day to finish that painting.（她花了一整天来完成那幅画。
）”，就好像爬山一样，得一步步花费力气上去呀。
3. “It seems that...”（似乎……）。
比如“ It seems that he is angry.（似乎他生气了。
）”，这就如同天空的云，好像是某种形状，但又不是那么确定。
4. “It is said that...”（据说……）。
像“ It is said that there is a monster in that lake.（据说那个湖里有个怪物。
）”，就好像是流传的神秘故事一样吸引人。
5. “Make it +形容词”（使它变得……）。
例如“Let’s make it interesting.（让我们使它变得有趣。
）”，是不是如同给一幅画上色，让它鲜活起来呢？6. “Find it +形容词to do something”（发现做某事是……的）。
像“ I find it difficult to learn this language.（我发现学习这门语言很难。
）”，这和走一条崎岖的路一样，能感受到其中的不容易啊。
我的观点结论：掌握这些关于 it 的经典句型就如同拥有了一把钥匙，可以打开英语表达的各种奇妙之门，让我们在英语的世界里更加自如地交流和表达呀！。
It的特殊用法
It的特殊用法一、作形式主语1．（1）It’s + adj.+ to do sth.It’s important to study English well.(2 ) It’s + adj. +that…It’s important/ necessary/ likely/ possible/ certain/…that…It’s likely that he will win the game.It’s certain that he will come this afternoon.2. It’s + v-ed + that…(1) It’s said/ thought/ believed/ supposed/ reported/ proved/ known…that…It’s known that the earth travels round the sun.= As is known to everybody, the earth travels the sun.= What is known to everybody is that the earth travels the sun.(2) It’s suggested/ advised/ proposed/ requested/ required/ insisted/commanded/ demanded/ ordered/…that…It’s suggested that she（should）finish her homework this afternoon.It’s required that I (should) go at once.3. (1) It’s + 名+that…常见的名词有：a pity, a fact, an idea, an honor, no wonder等It’s a pity that he can’t come to the party.It’s a fact that he didn’t pass the exam.It’s a good idea that we’ll go outing.It’s an honor that I was invited to the meeting.(It’s)no wonder (that) he always takes the first place in the exams.(2) It’s + 名+doing常见的名词有：use, goodIt’s no use crying.It’s no good crying over spilt milk.【谚语】牛奶溢了，哭也没用。
例说it引导的几个特殊句型
例说ｉｔ引导的几个特殊句型作者：曹建设来源：《中学文科·教研版》2008年第08期it引导的几个特殊句型，不仅是英语初学者的难点、易混点，而且也是近几年高考的热点之一。
现就其用法作如下归纳。
一、“ It + be + 一段时间（long / years / months / weeks）+ before从句”此句型分两种情况：如果主句用将来时（will be）,则before从句用一般现在时，意为“多长时间以后将发生某事”；如果主句用过去时was，则before从句也用过去时，意为“多长时间后发生了某事”。
例如： It was years before we realized the truth.过去了好几年，我们才了解到真相。
二、“ It+ be+ 一段时间+since从句”此句型意为“自从……以来已多久了”。
这个句型分两种情况：主句谓语动词是is/has been 时，则从句用一般过去时，整个句子表示现在的情况；主句谓语动词是was时，则从句用过去完成时，整个句子表示过去的情况。
但是要注意since从句中的动词是终止性动词时，时间就从该动作发生时算起；当从句中的动词是延续性动词时，时间就从该动作结束时算起。
例如：① It is two years sine hebecame a teacher. 他当老师已经两年了。
② It is two years since he was a teacher. 他不当老师已有两年了。
三、“It+ be +时间+ when从句”句意为“某事发生时正是……时候”。
此句型时态分两种情况：如果主句时态用过去时was，则从句也用过去时；如果主句时态用will be，则从句用一般现在时。
例如：① Itwas 12 o’clock when hegothome last nignt.昨晚他到家时已12点了。
②Itwill be the next morning whenhefinishes his work.他完成工作时将是第二天早晨。
（完整版）It的几个特殊句型
（完整版）It的几个特殊句型It的特殊句型一、高考真题1．(他突然想到) that he had an important conference toattend the next morning.( occur) （11高考78题）【答案】It occurred to him【解析】本题考察的是occur引导的句型”it occurs to sb。
that （某人突然想到）“根据后面的动词提示”had“，故要用一般过去时.2.During his last lecture, the scientist_________ (觉得) easier to explain the theory to those with some backgroundknowledge.(find)(09高考73题)【答案】found it/ found （that）it was ks5u【解析】考查句型结构。
根据提示词find及后面的形容词easier 可知此处可使用find it + adj.的结构，it后加be动词变做宾语从句也对，此句时态为一般过去时。
34. _It cost me _ (我花了) one thousand dollars to buy the painting last week. (cost) (08高考34题)【答案】It cost me【解析】考点：it做形式主语（特殊句式）关键词：It cost（★It 不用不给分，cost写成co sted扣0.5分）结构部分：It cost somebody how much money to do something 其它部分：me二、考点分析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。
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It的特殊句型一、高考真题1．(他突然想到) that he had an important conference toattend the next morning.( occur) （11高考78题）【答案】It occurred to him【解析】本题考察的是occur引导的句型”it occurs to sb。
that （某人突然想到）“根据后面的动词提示”had“，故要用一般过去时.2.During his last lecture, the scientist_________ (觉得) easier to explain the theory to those with some backgroundknowledge.(find)(09高考73题)【答案】found it/ found （that）it was ks5u【解析】考查句型结构。
根据提示词find及后面的形容词easier 可知此处可使用find it + adj.的结构，it后加be动词变做宾语从句也对，此句时态为一般过去时。
34. _It cost me _ (我花了) one thousand dollars to buy the painting last week. (cost) (08高考34题)【答案】It cost me【解析】考点：it做形式主语（特殊句式）关键词：It cost（★It 不用不给分，cost写成co sted扣0.5分）结构部分：It cost somebody how much money to do something 其它部分：me二、考点分析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 is your efforts, not your intelligence, __________(决定) your success. (determine )It was about 600 years ago that the first clock with a face and an hour hand was made.2. 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.3. 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.4. 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 necessarythat he (should) remember these words.5. It is said (reported, learned，believed....) 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，no wonder ... ) 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！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. This /It’s the first/second/third… time+现在完成时的句子It was the first second/third… time+过去完成时的句子It’s the first time that I have visited（我拜访）the city.(visit)It was the first time that you had knocked at the door of the teacher 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.It is / has been two years 20. since he went abroad（自从他出国）.（go）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。