it的用法 (2).ppt
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1、it 的用法一、考查一、考查 it 用作形式主语的用法用作形式主语的用法当不定式、动名词、从句等用作主语时,为避免头重脚轻,通常在句首使用形式主语it,而把真正的主语放在句子末尾。如:Its no good sitting up too late. 熬夜没有好处。It is quite clear that he has read the book. 很显然,他读过这本书。It doesnt matter what he says. 他说什么没关系。【特别提醒】注意it用作形式主语的三类特殊句式:1.用作动词look, seem, appear, happen, occur, follow等的
2、主语(后接that从句或as if从句)。如:It seems that he knows everything. 他好像什么都知道。It (so) happened that I had no money with me.碰巧我没带钱。It occurred to me that he helped me a lot.2.当系表结构后接有if 或when引出的状语从句时,通常在系表结构前使用形式主语表示说话人对某情况的看法。如: It was a great surprise to me when he did a thing like that. 他这样做使我很吃惊。It would be
3、 a tragedy if anything went wrong. 如果出了什么事就是一个悲剧。3.用于if it were not for / if it hadnt been for(若不是因为)。But for如:If it hadnt been for the freezing wind they could have reached the injured man in time. 要不是有刺骨的寒风,他们就及时赶到伤员身边了。二、考查二、考查 it 用作形式宾语的用法用作形式宾语的用法当不定式、动名词、从句等用作宾语且其后跟有宾语补足语时,就应在宾语补足语前使用形式宾语,而将真正
4、的宾语移至句末: We found it difficult to persuade her. 我们发现很难说服她。He makes it a rule to get up before dawn. 他习惯于天亮前起床。I think it very strange that he goes out walking almost every night. 我认为他几乎每晚都出去散步是很奇怪的。【特别提醒】注意it用作形式宾语的三类特殊句式:1. 动词+it+if / when从句当enjoy, like, dislike, love, hate, prefer, appreciate等动词后需
5、要接一个if或when引导的从句时,此时必须要先在动词后接it作形式宾语。如:She wont like it if you arrive late. 她不喜欢你迟到。He hates it when people use his bike. 他讨厌别人用他的自行车。Id prefer it if I didnt have to do so much work. 要是我不必做那么多工作,那就太好了。I would appreciate it very much if you would help me with it. 如果你能帮助我做这事,我会十分感激。2. 动词+介词+it+that从句动
6、词短语allow for(担保)、count on(期待)depend on(依靠)、insist on(坚持)、 see to(确保) ,answer for等后接that引导的宾语从句时,必须冠以形式宾语it。 。You may depend on it that he will turn up in time. 你可以相信他会及时赶到的。I cant answer for it that the boy is honest. 我不能保证这个男孩是诚实的。Ill see to it that all these letters will be sent to the post before
7、 twelve. 我将注意让所有的信件在12点以前送到邮局。3、动词have(表明,坚持说)、take(认为,猜想)、hide(隐藏)、publish(公布)、put(表达,写出来)等后接由that引导的宾语从句时,往往在从句的前面加上形式宾语。I take it that you will be leaving Shanghai soon.我认为你不久就离开上海。We published it that we had finished the project ahead of time. 我宣布我们已经提前完成了这项工程。 三、考查三、考查 it 在强调句中的用法在强调句中的用法强调句的基本
8、结构是:It+be+被强调部分+that(who)+其他部分。It was yesterday that he got married. 他是昨天结婚的。It was a computer that he bought last week. 他上个星期买的是一台电脑。【特别提醒】对于强调句的复习要特别注意两种情形:1.当强调句有插入语或复杂修饰语时:It was lack of money, not of effort, that defeated their plan. 他们的计划受挫,原因是缺少钱而不是没有尽力。It was more in sorrow than in anger tha
9、t he criticized his former colleague. 他批评以前的同事,并非出于气愤而是为他惋惜。2.当强调为特殊疑问句时:Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯? How long ago is it that you last saw her? 你上一次看见她是多久以前的事?四、考查四、考查 it 与与 one 的区别的区别两者均可代替前面提到的事物,区别是:it指的是与前面已提到的事物为同一物,此时的it等于“the (this, that, my.)+名词”;one 指的是与前面已提到的事物
10、为同一类物,此时的one等于“a+名词”。比较:I have a dictionary but Ive lent it to Mary. 我有一本词典,但把它借给玛丽了。I havent a dictionary; can you lend me one? 我没有词典,你能借我一本吗?五、考查五、考查 it 在习语中的用法在习语中的用法包括it的习语很多,比如make it就是其中很重要的一例。如:You can make it if you hurry. 如果你赶快还可以及时赶到。He wants to make it as a writer. 他想作一名作家而一举成名。You neednt
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