初中英语语法中it的用法 PPT 课件
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初中英语语法:it用作形式主语的用法一、基本用法当不定式、动名词、从句等用作主语时,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:Is it necessary to tell his father everything? 有必要把这个切都告诉他父亲吗?It’s 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 doesn’t matter what he says. 他说什么没关系。
二、几种特殊的形式主语(1) 用作动词look, seem, appear, happen, occur, follow等的主语(后接that从句或as if从句):It seems as if it is going to rain. 看来要下雨了。
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。
From this witness it follows that he must be guilty. 根据该证人的证词判断,他一定有罪。
(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: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 a tragedy if anything went wrong. 如果出了什么事就是一个悲剧。
(3) 用于其他固定句型,如if it were not for…(若不是因为),it’s time that…(该…了)等。
初中英语语法考点学习之形式主语it的考点用法it是否是形式主语背景:When the traffic is really heavy,his commute is stressful. It would be great if he could work from home one or two hours a week. 这句话中it是做形式主语吗?如果是的话,真正主语是if引导的主语从句,可if引导名词性从句时意思是“是否”,可这里if是“如果”之意。
It would be great if he could work from home one or two hours a week.如果他能每周在家工作一两个小时,那就太好了。
本句,It 是人称代词作句子的主语,指代 if 从句的内容。
有关详情,网友可参考我以前的一个解答:代词it 可以指代状语从句的内容有网友问,以下句子中的 it 到底是什么词?作什么句子成分?I don’t like it when you shout at me.I would appreciate it if you could let me know in advance whether or not you will be coming.1.以上两句中的 it,并非“形式宾语”,而是“真实宾语”,it 是实实在在的人称代词,它替代的是when从句和if 从句的内容:分别为“你朝我大喊大叫”和“让我知道...”这两件事情。
2.when 和 if 仍然是两个状语从句,仍然表示时间和条件概念。
其实,代词it在从句之后或之前均可,或者说,主句和从句位置可以互换,这充分说明 it 是人称代词。
例如:If I can get home by eight o’clock, I call it good luck.If you could keep it to yourself I’d appreciate it.He would much appreciate it if you could do him that favour.She won’t like it if you arrive late.3.it 除了充当主句的宾语,还可以充当主句的主语,从它作句子的主语来看,就更加证实了它是人称代词。