it为形式主语的句式有那些啊
当代英语中,通常用it 做形式主语,将不定式和动名词置于谓语后面,特别是主语较长时,或在一些习惯用法中.
1） 谓语是系表结构（be + 形容词 / 名词）时,常将不定式后置,构成句型 “it + be + 表语（形容词 / 名词）+ 不定式”.
例 1 It is my duty to care for that patient.
照料那位病人是我的职责.（做主语的不定式to care for that patient 后置,it 为形式主语）
例 2 It is not an easy thing to master a foreign language.
掌握一门外语不是件容易的事.
例 3 It isn’t right to speak ill of someone behind his back.
在别人背后说坏话是不对的.
2） 当谓语是 take,make,pay,cost ,require,feel,need 等动词时,或者是与情绪有关的动词 delight,amuse,excite,annoy,irritate 等时,习惯上常用 it 做形式主语,并将不定式后置.
例 1 It takes only ten minutes to get there.
到那儿只需十分钟.
例 2 It pays to be honest.
诚实是不会吃亏的.
例 3 It feels good to stay away from the crowded city.
能远离拥挤的城市,感觉真不错.
例 4 It annoyed her to see someone spit on the ground.
看见有人随地吐痰让她很生气.
3） 同不定式一样,动名词也可用于“it + be + 表语 + 动名词”句型中,二者的区别可参见10．2．2 中1）的论述.下面两组句子没有多大差异.
例 1 A） It is a waste of time to argue with him
B） It is a waste of time arguing with him.
和他争辩是浪费时间.
例 2 A） It is worthwhile to discuss this again.
B） It is worthwhile discussing this again.
这一点值得在讨论一下.
4） 但表语是（of）no use,not any use,not the slightest use,no good,not much good,fun等时,常用动名词（不用不定式）做主语并后置,用 it 做形式主语.
例如 It’s no use crying over spilt milk.
覆水难收.
5） 动名词还可在 there be 句型中做主语（不能用不定式）,常见形式为 “there is no + 动名词”或 “there is no / any + 名词 + 动名词”.
例 1 There is no denying the fact.
事实无可否定.
例 2 There isn’t any use trying again.
再试也没用
it做形式主语放在句子的哪里？
前后句子主语一致的时候，关联词放在主语后面。修改病句时，当句子是复句，看关联词。 （1）考虑关联词与主语的位置是否颠倒。 前后两个分句主语一致，关联词应放在主语之后；主语不一致，关联词应放在主语之前。 （2）考虑分句之间的位置关系是否正确。 含义 “it” 作形式主语：当表语为 no use，no good，no harm，any good，fun等名词或useless，nice，good，interesting，worthwhile等形容词时，句首常用it作形式主语，动名词后置。句型常用于说明“某种活动或某件事情如何”。 以上内容参考：百度百科-主语
主语从句中it做形式主语的常见句型有哪些？
主语从句中it做形式主语的常见句型有哪些？ 常见句型有： It + be + 名词片语 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question. It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， It + be + 形容词+主语从句 It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， It + be + 形容词+ for *** .）+ 动词不定式 这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for *** ， It + be + 形容词 + of *** . + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。 It + be +名词片语 + 动词不定式 It + be + 名词或形容词+ 动名词 It + take ( *** . )+ 时间（金钱）+ 动词不定式 用的比较少的 It + take ( *** . )+ 时间（金钱）+ 动词不定式 举几个例子比如： It took the workers almost three years to finish building the dam. It will take a whole day to get to the of the mountain on foot. It作形式主语的常见句型有哪些 【It作形式主语常见句型】 动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有： 1. It + be + 形容词+主语从句，如： It is uncertain whether he can e to Jenny’s birthday party or not. 2. It + be + 名词片语 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question 等， 如：It’s a pity that you missed the exciting football match. It remains a question whether he will e or not. 3. It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如： It is reported that 16 people were killed in the earthquake. It is not decided who will give the operation to the patient. 4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等， 如： It seemed that he didn’t tell the truth. It happened that I was out when he called. 5. It + be + 形容词+ for *** .）+ 动词不定式 这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for *** ，如： It’s necessary for the young to master o foreign language. It is unwise to give the children whatever they want. 这类形容词有：easy, difficult, hard, important, possible，wise 6. It + be + 形容词 + of *** . + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。 某人和这些形容词可以构成主系表结构。如： It’s very kind of you to help me with the work. =You are kind to help me. It seemed selfish of him not to share his dictionary with others. =He seemed selfish not to share his dictionary with others. 7. It + be +名词片语 + 动词不定式，如： It is not a good habit to stay up too late. 8. It + be + 名词或形容词+ 动名词，这类名词和形容词常常是： good, no good, no use, a waste of, useless, senseless等，如： It’s a waste of time talking to her any more. It is no use arguing about the matter with him. 9. It + take ( *** . )+ 时间（金钱）+ 动词不定式，如： It took the workers almost three years to finish building the dam. It will take a whole day to get to the of the mountain on foot. if可以引导it做形式主语的主语从句吗? 总的来说，严格的英语不可以，要用whether 美式英语非正式场合可以。 Whether it is right to do is not my business. 这样做对不对不关我的事。 宾语从句“it”做形式主语的句子有哪些？ it 代替连词 that 引导的从句作形式主语 例句：It's said that Tom has e back from abroad It was reported that dozens of children died in the aident . it 代替连线代词或连线副词引导的从句作形式主语。 例句：It is still a question when we shall have our sports meet . 我们将什么时候举行运动会还是一个问题。 It is uncertain whether he can attend this conference or not . 他能否来开会还不能确定 it 英 [ɪt] 美 [ɪt] pron.环境;情况,局势;正是所需(要或想望)的事物;〈非正式〉 *** ; *** ;(儿童游戏中的)捉人者,找人者 ing 形式作主语的主语从句 你的描述有问题，主语从句：That he works hard makes him a suessful bussines *** an.在主语从句里，不会出现ing做主语的形式，ing做主语是动名词做主语，举例：Swimming is a good sport. 在复合句中做主语的从句叫主语从句？ 对 如:What you have said is totally wrong.其中what you have said 是主语从句. 宾语从句it做形式主语的句子 It代替从句作形式主语的常见句型 1. it 代替连词 that 引导的从句作形式主语。 1) it + be + 过去分词 + that 从句: It's said that Tom has e back from abroad . It was reported that dozens of children died in the aident . 可用于该句型的过去分词还有：known , thought , told , believed , hoped , announced ,expected , decided , suggested等，该句型常可以转换成含有宾语从句的复合句或者含有不定式作主补的简单句。如： It's said that Tom has e back from abroad . →People say that Tom has e back from abroad . →He is said to have e back from abroad . 2) It + be + 名词片语 + that 从句: It's a pity that he can't swim for his age . It's a wonder that you could finish such a hard task in such a short time . 可用于该句型的名词片语还有：an honour , a good thing , a fact , a surprise , good news等。 3) It + be /seem + 形容词 + that 从句: It is likely that they will beat us tonight .今晚很可能他们会赢我们。 It doesn't seem that she will give us a hand .她帮我们的可能性似乎不太大。 可用于此句型的开容词还有；wonderful , true , good , right , wrong , (un)important ,useless , surprising , clear , possible , unusual , lucky , certain 等。 4) It + seem / appear / happen + that 从句: It seems that he enjoys pop songs very much .看来他非常喜欢流行歌曲。 It appears that Tom might change his mind .看来汤姆会改变主意。 It happened that I went out that day .碰巧我那天外出了。 2. it 代替连线代词或连线副词引导的从句作形式主语。 1) It is known (not decided , not made clear , found out , discussed , being discussed , being considered , a question , uncertain等) + 连线代词或连线副词引导的从句。 It is still a question when we shall have our sports meet . 我们将什么时候举行运动会还是一个问题。 It is uncertain whether he can attend this conference or not . 他能否来开会还不能确定。 2) It doesn't matter(doesn't matter too much , doesn't make too much difference等) + 连线代词或连线副词引导的从句。如： It doesn't matter whether we go together or separately . 我们一起去还是分开去都可以。 It doesn't matter too much to me what you do or where you go . 你做什么或去什么地方，对我都无关紧要 it引导主语从句和it做形式主语还有强调句型的区别 “it”引导主语从句和“it”做形式主语还有强调句型的区别： it引导的主语从句，形式主语就是it，真正的主语在句子的后面，通常是to do的不定式短语。 而强调句的结构 it is/was+被强调部分+that/who+句子其余部分，结构词it is/was和that/who都是没有实际意思的，只是构成句子结构的词而已。这个强调句只能强调名词和代词，也就是主语和宾语，不能强调其他句子成分。 主语从句：It is kind of you to help me with my housework. 强调句：It is you who help me with my housework. 主语从句中it做形式主语的常见句型： It + be + 形容词+主语从句，如：It is uncertain whether he can e to Jenny’s birthday party or not. It + be + 名词片语 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：It’s a pity that you missed the exciting football match. It remains a question whether he will e or not. It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，如：It is reported that 16 people were killed in the earthquake. it 做形式主语时、句子是主语从句么？ 形式主语是动词不定式的一种,它也是逻辑主语, 可以把它归类到逻辑主语的第一种(不定式的逻辑主语) 用作宾语的不定式，用作目的状语，用作结果状语的不定式都是属于不定式的大概念里面的。 形式主语it 作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替 的是句子的逻辑主语，概括起来会有如下情况： 句子的逻辑主语为不定式 如：It is very kind of you to give me a hand in time. It is my pleasure to address the meeting. It was pretty hard for him to bring up the child on his own. 句子的逻辑主语为从句 如：It so happened that the tickets were sold out. It is extremely obvious that she has been lying about her identity. It suddenly ourred to me that the message must have been hidden beeen the layers of the briefcase. 句子的逻辑主语为动名词短语 这类句子远不如前面两种出现率高，主要在（no good, waste, useless, no use, dangerous）等词语的后面用 如：It is no use reasoning with him. It is no good reading in dim light. 作形式主语的代词只能用it ，不能用that，this等词。例如: 1) It is easier to lose friends than to make friends. 交朋友难而失去朋友比较容易。 2) It is important for modern young people to master at least o foreign languages. 掌握至少两门外语对于当代年轻人来说是很重要的。 以上两句中的it是形式主语，真正的主语是后面的不定式短语。 3) It is considered no good reciting without understanding. 不理解的背诵被认为是没有好处的。 4) It is no use crying over spilt milk. 覆水难收。 以上两句中的it是形式主语，真正的主语是V-ing形式。 5) It is a fact that English is being aepted as an international language.英语作为一门国际语言正日益为人们所接受，这是不争的事实。(NMET,95) 6) It depends on the weather whether we will go. 我们去不去得看天气行事。(其中的whether 不能换成if,因为if不能引导主语从句。) 以上两句中真正的主语是名词性从句。 it 作形式主语主要用于下列三种情况不定式作真正主语 主要用于下列句型： 1. It + is/was + adj./n. (形容词或名词) +to do sth. A. 名词作表语。主要有a pity, a pleasure, an idea等。 例如： In fact________is a hard job for the police to keep order in an important football match. ( 2001上海高考题) A. this B. that C. there D. it (答案为D) 再如： It is a great pleasure to do this. 这样做多好啊。 It is a good idea to think this way. 这样考虑问题是个好办法。 除be外，其他动词也有跟名词的情况。例如： It seems a pity to waste the food. 浪费这些食物真可惜。 It requires efforts to master a foreign language. 掌握一门外语需要种种努力。 B. 形容词或形容词短语作表语。 分两种情况： 1) 下列形容词： kind, good, nice, clever, wrong, right ,foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。例如： It was foolish of you to leave school.你中途退学，真是傻瓜。 It was brave of her to speak out in public. 她能当众大声讲话，真勇敢。 这种of *** . to do sth. 句型，of 的宾语可以作句子的主语。上面两个句子可以改写为： You were foolish to leave school. She was brave to speak out in public. 2) 其他形容词作表语，常见的形容词有：necessary, hard， important, difficult, easy, possible，mon等。例如： It is necessary to use a short-wave radio to pick up the programmes. 必须用短波收音机才能收到节目。 如果要说明不定式表示的动作是谁做的，可以在不定式前加for + 名词或代词 + to do sth.(for 后的宾语不能作句子的主语)。名词或代词作不定式的逻辑主语，即表示不定式所指动作的执行者。在此句型中，形容词只对不定式行为者作某种描述，而不涉及其品行。例如： It is not hard for one to do a bit of good. 对于一个人来说做点好事并不难。 It,s mon for leaves to fall from the trees in the fall. 秋天树叶从树上落下是件常事。 需要注意的是：动词不定式作主语，一般情况下用it作形式主语，而把动词不定式(从句)放在后面。也可以直接用不定式作主语。例如： It is wrong to tell lies. = To tell lies is wrong. 撒谎是不对的。 但在疑问句和感叹句中，只能用it作形式主语。 例如： Isn't it a good idea to have a walk around? 出去兜一圈难道不是一个好主意吗？ What a pleasure it is to work with you! 同你一起工作是多么愉快啊！ 2. It + v. + to do sth. 动词不定式作主语时除动词be以外，动词take, cost， need, require, make, sound, our 等也可用it作形式主语，而把动词不定式放在后面。例如： It took us three years to plete the project. 我们花费三年时间才完成了这项工程。 It sounds reasonable to do it this way.听起来这样做有道理。 It needed hard work to finish the job. 要完成这项工作需要努力地工作。 It didn,t our to me to ask him to help me. 我根本没想到要找他帮忙。 动名词作真正主语 用于这种形式的是一些特定的形容词和名词。例如： It was nice meeting you. 见到你真高兴! (分别时用) 它与不定式作真正主语的区别在于，动名词说到的动作已经发生。 例如: It is nice to meet you. (刚刚见面时用) it 作形式主语，动名词作真正主语主要用于下列句型： It's +n.(名词或名词短语)/adj.(形容词)+ doing sth. 1)下列形容词后常用动名词作真正主语：nice, good, useless, hard, foolish, enjoyable, worthwhile等。例如： It is nice talking to you. 跟你交谈真是愉快。 It's foolish behaving like that. 这样的表现是很愚蠢的。 It is useless doing that. 那样做没用。 2)下列名词或名词短语作表语时常用动名词作真正主语：use, good, fun, a waste of, job, task等。例如： It's a waste of time doing this. 这样做是浪费时间的。 It's no good (use) doing that. 那样做没好处(没用)。 It's an awful job doing this. 做这事真是一件可怕的差事。 It's fun doing this. 做这事真有趣。 It is not an easy task doing this work. 做这工作真非易事。 名词从句作真正主语 用it 作形式主语的结构主要用于下列句型： It +谓语+名词从句(主语从句、表语从句、同位语从句) 1. It is +名词+从句: 这样的名词有a fact, a surprise, an honor(非常荣幸),a pity, mon knowledge(常识)等。例如： It is mon knowledge that the full moon brings fair weather. 皓月兆天晴,这是常识。 It is a surprise that you gave such an answer to the question. 你对这个问题作了这样的回答，令人吃惊。 2. It is +形容词+从句 : 这样的形容词有natural, true, strange, necessary, important, obvious(很明显), certain, wonderful, funny, possible, likely, probable等。例如： It is certain that free medical care will be given to most people in our city. 我们城市的多数人将享受免费医疗，这是一定的。 It is probable that he has known everything. 很可能他什么都已经知道了。 3. It +动词+从句: 这样的动词有seem,happen, appear, look, matter, make, strike, our(突然想起)等。 It appeared that he had a taste for music. 看来他对音乐有一定的鉴赏力。 It made us very happy that she was saved.她能化险为夷令我们大家很高兴。 4. It + be + 分词+从句: 这样的分词有 said(据说)， reported(据报道),believed(人们相信)，known(众所周知)，decided(已决定)，proved(已证实), thought, expected, annouced, arranged, amusing, puzzling, striking等。例如： It is said that Li Hao has been to Europe.据说李郝去过欧洲。 It was amusing that a rabbit ran out of the empty box on the desk.桌上的空盒子里竟然跑出来一只兔子,太有趣了。 需要说明的是，大部分连线词引导的主语从句都可以用 it充当形式主语。例如： It remains unknown when they are going to get married. 他们何时结婚依然不明。 It says in the newspaper that the enemy has been defeated. 报纸上报导敌人被打败了。 形式主语： It +be+(the)+adj.+for *** .+to do sth.
it做形式主语是什么基本句型
it做形式主语基本句型： (1)It is ＋名词＋从句It is a fact that … 事实是… It is an honor that …非常荣幸 It is common knowledge that …是常识It’s a pity that you missed the exciting football match.多么可惜啊，你错过了一场精彩的足球比赛。 (2)it is ＋形容词＋从句It is natural that… 很自然… It is strange that… 奇怪的是…It is uncertain whether he can come to Jenny’s birthday party or not.他来不来参加简的生日派对，这个不确定。(3)it is ＋不及物动词＋从句It seems that… 似乎… It happened that… 碰巧…It seemed that he didn’t tell the truth.似乎他没有讲真话。
it作形式主语是什么?
动词不定式、动名词短语起、从句在句子中起主语作用，而这一部分用词较多时，可以用it作为形式主语，放在句首代表其后所说的事实上的、真正的主语，而把真正的主语放在后面。 1、It +谓语＋动词不定式。It作形式主语，动词不定式作真正的主语。例如：It is difficult to climb a mountain.爬山是很艰难的。It’s a good habit to do morning exercises.作早操是个好习惯。It’s important to do proper memory work in the study of a foreign language.在学习外语时适当地做一些有助于记忆的练习是很重要的。It is right to do so.这样做是对的。 2、It＋谓语＋动名词短语。It作形式主语，动名词短语作真正的主语。例如：It is dangerous playing with fire.玩火是危险的。It is no use learning without thinking.学而不思则罔。It’s useless arguing with a silly boy.和笨孩子争论是没有用的。 3、It＋谓语＋名词性从句。It作形式主语，以that引导的名词性从句是真正的主语。例如：It is a pity that you didn’t see such a good film.你没看这么好的电影，真可惜。It is certain that we shall succeed.我们一定会成功。 It is strange that nobody knows where he lives.真奇怪，谁也不知道他住在哪里。（It is strange that…后面可用虚拟语气。如：It is strange that he should have made such a mistake.他居然犯了这样一个错误，真奇怪。It is strange that nobody should know where he lives.居然没有人知道他住在哪里，真奇怪。） It is said that the plane will take off at ten tomorrow morning.据说飞机明天上午十点起飞。
it是形式主语还是真正的主语？
it做主语时和take搭配，it通常做形式主语，真正的主语在后面，构成固定句型：It takes sb some time to do sth.(花费某人多长时间做什么)；或者It takes sb sth to do sth（做什么需要某人什么）。
it和cost搭配时，it通常是第三人称人称代词主格，代替前面出现过的名词。
例如：
It takes her twenty minutes to walk to school every day.
（it做形式主语，代替后面动词不定式）
她每天要花二十分钟的时间步行去上学。
It took him hours to cook a simple meal because he's such a perfectionist .
（it做形式主语，代替后面动词不定式）
他要花几个小时才能做好了一顿便饭，因为他是一个追求尽善尽美的人。
It takes us an hour to finish the work.（it做形式主语，代替后面动词不定式）
我们需要一个小时干完成这项工作。
The skirt is beautiful but it cost her 800 dollars. （it指裙子） （cost是过去式）
裙子漂亮，但是花了她800元。
Look at the dress she wears. It cost her ten thousand dollars.（（it指洋装））
看她身上穿的洋装，她花了一万元买这件洋装。