It作形式主语常见用法
it作形式主语的特殊句型
昂立外语：/
it作形式主语的特殊句型
it用作形式主语有不少非常有用的句式，比如以下一些就值得注意：
一、用于it seems (appears) that…句式。
如：
It seems that he knows everything. 他好像什么都知道。
It appears that we may be mistaken. 看来我们可能弄错了。
但是，英语一般不说it looks that…，可改用it looks as if…。
如：
It looks as if we’ll be late. 我们似乎要迟到了。
二、用于it happens (occurs) that…句式。
如：
It happened that I was standing next to him when he collapsed. 他倒下的时候我恰巧站在他旁边。
It didn’t occur to him that she would refuse his invitation. 他没有想到她会拒绝他的邀请。
三、用于it follows that…句式。
如：
He is wrong, but it does not follow that you are right. 他错了，但并不能由此推断你是对的。
She’s not in the office but it doesn’t necessarily follow that she’s ill. 她不在办公室, 并不见得就是病了。
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it做形式主语
it做形式主语形式主语指的是在动名词或者名词性从句做主语时，为了避免主语太长而导致整个句子头重脚轻的情况而用在句首的it，真正的主语（即动名词或名词性从句）则放至句末。
这样就能够保证整个句子形式上的美感。
动名词做主语时it做形式主语动名词to do和doing做主语时it做形式主语主要有以下几种常见句式：(1) it + be + noun + (for sb) to do sth能够满足这个句式的常见名词有：idea, pity, pleasure等。
例句1：It's a hard work for the traffic police to direct traffic in such a hot weather.在如此炎热的天气指挥交通对于交警来说十分艰难。
例句2：It's a good idea to go for an outing in Spring.在春天出去郊游是个好主意。
例句3：It's a pity to miss the biggest automobile exhibition.错过那次最大的车展真遗憾。
(2) it + be + adj + (for sb) to do sth能够满足这个句式的常见形容词有：easy, hard, difficult, necessary, important, possible 等。
例句1：It's necessary to be punctual. 守时很有必要。
例句2：It's difficult for a little kid to totally understand your words.让一个小孩完全理解你的话很难。
例句3：It's common for leaves to fall from the tree in autumn.秋天树叶飘落是普遍现象。
(3) it + be + no good/use/sence.... + doing sth例句1：It's no use complaining about your terrible surroundings.抱怨你周边的恶劣环境是没有用的。
高中英语真题-it用作形式主语代替动名词主要用于哪些句式
高中英语真题:it用作形式主语代替动名词主要用于哪些句式it用作形式主语代替动名词的用法主要见于以下句式：1. It is no use (no good, fun, great fun, a new experience, a great ho nour, etc) doing sth。
如：It is no good talking. 空谈是没有用的。
It’s fun working for him. 为他工作很有意思。
It’s great fun sailing a boat. 扬帆驾舟十分有趣。
It’s no use shouting at him—he’s deaf. 向他叫喊是没有用的——他耳聋。
It has been a great honour your coming to visit us. 你来看望我们是极大荣幸。
2. It is good (nice, useless, interesting, pleasant, tiring, etc) doing sth。
如：It is useless speaking. 光说没有用。
It was pleasant sitting there. 坐在那里很愉快。
It’s so nice sitting here with you. 和你坐在一起真是愉快。
It’s good hearing English spoken. 听到人讲英语，我很高兴。
It’s terribly tiring working late like this. 这样干到深夜是非常累人的。
3. it is worth while doing sth。
如：It’s worth while doing the work. 这项工作值得做。
Do you think it’s worth while quarrelling with me? 你认为和我吵值得吗?4. 其他句式。
“It”作形式主语和宾语
It is very important to learn a foreign language. (学一门外语非常重要。) 翻译 1.覆水难收。
I_t_is__uselessc_r_y_in_g_ over the spilt milk. 2.她嫁给那样的男பைடு நூலகம்真让人惊讶。
_I_t_w_a_s__really surprising _t_h_a_t_ she _m__a_rr_i_e_d_ a man like that.
② 某些表示“喜、怒、哀、乐”的动 词，如like, enjoy, love, hate等，往 往不能直接接宾语从句；
I don’t like it that he’s so lazy. 我不喜欢他那么懒惰。
I hate it when my mother asks me to eat eggs. 我讨厌母亲要我吃鸡蛋。
How long _d_o_e_s_i_t_t_a_k_e_y_o_u_to go to Beijing from Fuzhou by train?
二、It 用作形式宾语
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。此时it仍只起先行引 导作用，本身无词义。
翻译：他坚持说自己是无辜的。 He __in_s_i_s_te_d__o_n__it _t_h_a_t__ he was innocent.
④ 由及物动词与介词组成的固定搭 配中，宾语从句若作该动词的宾语时， 须借用it。 I leave it to your own judgment whether you should do it.
it作形式主语和形式宾语用法
it作形式主语和形式宾语用法2009-09-21 09:58:41| 分类：study | 标签：|字号大中小订阅一、It 用作形式主语当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。
此时it只起先行引导作用 ...一、It 用作形式主语当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。
此时it只起先行引导作用，本身无词义。
e.g. It is wrong to tell a lie.(说谎是错误的。
) 〔It为to tell a lie的形式主语〕It is no use arguing about it.(争吵是没用的。
) 〔It为arguing about it的形式主语〕It is uncertain who will come.(谁要来还不确定。
) 〔It为who will come的形式主语〕It 作形式主语的常见句型：①It + be + 形容词+ to do sth. / doing / that ….e.g. It is very important to learn a foreign language.(学一门外语非常重要。
)It is useless crying over the spilt milk.(覆水难收。
)It was really surprising that she married a man like that.(她嫁给那样的男士真让人惊讶。
)②It + be +名词词组+ doing / that ….e.g. It is no good telling lies.(撒谎没好处。
)It is a pity that you didn’t go to see the film yesterda y.(你昨天没看成那部电影真遗憾。
“It”作形式主语和形式宾语的用法详解
新希望英语语法精讲------“It”作形式主语和形式宾语“It”作形式主语和形式宾语的用法详解It作形式主语和形式宾语用法，是英语学习的主要语法项目一。
无论是单项选择，还是完行填空，it用法始终是反复考查的重、热点一。
现将it在特殊句型中作形式主语和形式宾语用法，进行如下归纳分析，以供学习参考。
一、It 用作形式主语当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。
此时it只起先行引导作用，本身无词义。
e.g. It is wrong to tell a lie. (说谎是错误的。
) 〔It为to tell a lie的形式主语〕It is no use arguing about it. (争吵是没用的。
) 〔It为arguing about it的形式主语〕It 作形式主语的常见句型：① It + b e + 形容词+ to do sth. / doing / that ….e.g. It is very important to learn a foreign language. (学一门外语非常重要。
)It is useless crying over the spilt milk. (覆水难收。
)It was really surprising that she married a man like that.(她嫁给那样的男士真让人惊讶。
)② It + be +名词词组+ doin g / that ….e.g. It is no good telling lies. (撒谎没好处。
)It is a pity that you didn’t go to see the film yesterday. (你昨天没看成那部电影真遗憾。
)It is a truth that there would be no new without the Communist Party.(没有共产党就没有新中国，这是毋庸质疑的。
it作形式主语和形式宾语
it既可作人称代词，用来表示动物或无生命的物体等，也可以作无人称代词，在句中作主语，表示“时间”、“距离”、“天气”等。
它还可以引导强调句，使语气得以加强。
此外，it在句中能作引导词，充当句子中的形式上的成分，如形式主语、形式宾语等。
㈠it作形式主语：it作形式主语时没有具体的意义，而只是帮助把真正的主语移到句子后部去，使句子显得平稳一些。
it作形式主语时，可以代替三种形式：不定式、动名词和主语从句。
⒈it代替不定式短语常用于下列句型中：It + be +形容词+ (for/of sb.) to do sth.It + be + 名词+ to do sth.It takes sb. some time to do sth. 干…花了某人…时间It’s up to sb. to do sth. 干…是某人的职责或义务如：①It is everyone’s duty to obey the law.遵守法律是每个人的义务。
（it作形式主语, 代替不定式短语to obey the law）②It is difficult for a foreigner to learn Chinese.对于一个外国人来说，学习汉语是困难的。
（it作形式主语, 代替不定式短语to learn Chinese）③It is not right to use these places as rubbish dumps.把这些地方用来倒垃圾是不对的。
（it作形式主语, 代替不定式短语to use these places as rubbish dumps）④It took them a year to build the bridge. 建这座桥花了他们一年的时间。
（it作形式主语, 代替不定式短语to build the bridge）⑤It is bad manners to stare at people.瞪着眼睛看人是不礼貌的。
it 作形式主语句式结构
4. The news that ouiting.
5. The suggestion that students should learn something practical is worth considering.
6. It + be +形容词+ of sb. +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：
表语从句：
1. This is what I want to do.
2. The house is what he needs.
3. The question is how the people can find an effective way to store the sun’s heat.
4. The question is who can complete the difficult task.
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.
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It作形式主语常见句型
1。It + be +形容词+ that-从句
可用于此句型的形容词有： wonderful, true，good,right，wrong,（un)important，useless，
surprising,disturbing，frightening,alarming,clear，unusual，lucky，certain, necessary等。 如:
① It is quite certain that he will be at the meeting。他将出席会议是无疑的.
② It is surprising that he came late to school this morning.他今天早上迟到真令人惊讶。
③ It is important that we （should） study hard.我们努力学习是很重要的。
注意： 该句型中的形容词是（un）important， necessary等时,从句应为 （should ）+
动词原形.
It is important that we （should) learn English well。
It is necessary that he (should） remember these words.
2。It + be +名词+ that-从句
适用该句型的名词（词组）有: a pity，an honor,a good thing,a fact，a surprise，a question,
a shame，a custom， a truth,our hope， no wonder, good/bad manners等。如：
① It is a pity (that） you missed the sports meeting last week. 你错过了上周的运动会太
可惜了。
② It is a fact that English is being accepted as an international language。 事实上英语已经
被作为一种国际语言而接受了.
3. It ＋seem／ appear／ happen的适当形式＋that从句。
① It seems that there is a big waste pipe coming down from the town.
②It appeared that he was calm, but inside his heart was beating wildly with fear.
4。 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。
5。 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。
6. It is the first ( second 。.。 ） time that .。.
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.
7. It + be + adj。/ n. （for sb。 / of sb.） + to do sth. 该句型中的形容词通常是表示事物的
特点或特征的如difficult，hard，easy,impossible，necessary,important等，此时用for；或表
示人的性格特征或特点的如nice，good，bad，kind，silly,foolish，wise，clever,
careless,rude,brave，cruel，careful, grateful等，这时要用 of。如：
① It is foolish of you to give up such a good chance.
② It is necessary for college students to master at least a foreign language。