这个句子如果放在主语前后的区别没有上下文，怎么区别是不是it做形式主语，doing做实际主语放后面的情况？

来源：蜘蛛抓取(WebSpider) 时间：2023-10-06 02:26 标签： 如果放在主语前后的区别

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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：① It + 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。)② It + 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 yesterday.(你昨天没看成那部电影真遗憾。)It is a truth that there would be no new China without the Communist Party.(没有共产党就没有新中国，这是毋庸质疑的。)③ It + be + 过去分词 + that ….该句型常见动词有：say, hope, think, suppose, expect, report, know, believe, decide, etc.e.g. It is said that they have invented a new type of computer.(据说他们发明了一种新型电脑。)It is believed that China will become one of the strongest countries in the world.(大家都相信中国将会步入世界强国之列。)It was reported that more than 170 thousand people died in the 2004 tsunami.(据报道，至少有十七万人在2004年那场海啸中丧生。)④ It + seems / appears / happens等不及物动词 + that ….e.g. It seems that he enjoys pop songs very much.(似乎他非常喜欢流行歌曲。)It appears that Tom might change his mind.(看来汤姆可能会改变主意。)⑤ 若句子是疑问形式，就只能用it作形式主语。e.g. Does it matter much that they won’t come tomorrow?(他们明天不来很重要吗？)Is it true that he will go abroad next week?(他下周出国是真的吗？)⑥ It + takes + (sb.) + some time + to do sth.这是一个表示“（某人）花多少时间干某事”的句型，其中it是形式主语，代替后面的不定式（to do sth.），句型中的sb.也可以省略。e.g. It took me some time to read the reading materials.(我花了一些时间才读完那段阅读材料。)It took him fourteen hours to go to New Zealand from Shanghai by plane.(从上海乘飞机去新西兰花了他14小时。)How long does it take you to go to Beijing from Qingdao by train?(从青岛坐火车到北京一般要花多久时间？)I am not sure, but I think it takes at least nine hours to get there.(我不能肯定，但估计至少要九个钟头才能到那儿。)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。下列四种情况须用it 作形式宾语：① 当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时（如think, make, find, consider, feel, suppose等）；e.g. They found it pleasant that they worked with us Chinese.（他们发现与我们中国人一起工作很愉快。）I don’t feel it difficult to understand the Special English.（我觉得理解英语特别节目并不难。）He makes it a rule never to borrow money.（他立志决不向别人借钱。）I think it no need talking about it with them.（我认为没必要跟他们谈。）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；e.g. 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。）③ that引导的宾语从句不能直接作介词的宾语；e.g. You may depend on it that we shall always help you.（尽管放心，我们会随时帮你的。）Would you see to it that she gets home early?（你负责保证她早到家，好吗？）He insisted on it that he was innocent.（他坚持说自己是无辜的。）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。e.g. I leave it to your own judgement whether you should do it.（我让你自己判断这事是否该做。）We owe it to you that there wasn’t a serious accident.（多亏了你才没有发生严重事故。）
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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itiswas被强调部分that who句子其余部分，结构词itiswas和thatwho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。形式主语去掉 it is…… that 后句子不完整，且是中文式的表达方式，如：It is important that we study English .我们学习英语很重要。你看，哈：去掉it is ……that 后：We study English important. ，谓语部分缺 is，完全是中文式的表达方式，当然为错句。强调句型去掉 it is……that 后，句子完整，且纯英文的表达方式，如：It was here that I saw the old man.我就是在这里看到老人的。去掉 it is …… that 后：here I saw the old man . I （主语）saw （谓语）the old man （宾语）here（地点状语）欢迎大家关注我，给我点赞
1、it作为形式主语的句式如下：It + be + 名词 + that从句：It is a fact that
事实是。it在主语从句中形式主语，that之后的句子是句子真正的主语。因为要避免头重脚轻，be动词后面，that之前的词语数目不能太多，需要一个it保持平衡。2、It + be + 动词的过去分词+ that从句:It is said that 据说。It + 不及物动词（vi） + that 从句：It seems that 似乎。It + be + 形容词 + that从句。It is natural that… 很自然…3、It在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”。是所有的句式把形式主语it去掉之后，都可以把that从句放到前面来。比如It is a common knowledge that oil floats on the water. （油浮在水面上是常识。）给大家分享美食教程做法，谢谢关注。

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