It 既是 代词又是引词。作代词时,它可做人称代词、指示代词、非人称代词,用于前指、非确指或习语中。
it作引词时,它本身无实义,只起先行引导的作用。可作 形式主语(it is + adj. + for/of sb. to do sth.)或 形式宾语(it + adj. + to do sth.),真实的主语或宾语是 不定式、 动名词或名词 从句,它们则放在后面。It 也用于 强调句结构。
如想强调某个词或部分,可用it is (was) + 强调部分(主语、宾语或状语) + that(who)…的强调结构。本章要求了解代词it 和引词it 的各种用法,重点掌握it 用于前指或后指;引导词it 用于强调结构。
例:It is Tom’s sister who have had won the first place in the 100 meter race.
注意:
有时为避免句子头重脚轻,常用形式主语it代替 主语从句作形式主语放于句首,而把主语从句置于句末。主语从句后的 谓语动词一般用单数形式。常用句型如下:
It is necessary (important, natural, strange, etc.) that …
It is suggested (requested, proposed, desired, etc.) that…
That- 从句做主语通常用it作先行词,而将that-从句置于句末,例如:
It is quite clear that the whole project is doomed to failure. 很清楚,整个计划注定要失败。
It's a pity that you should have to leave. 你非走不可真是件憾事。
价值300元外教英语课程领取:http://www.acadsoc.com.cn/lps/lp4.htm?search=700053 (北美原版教材)
口语英语速成班:http://www.acadsoc.com.cn/lps/lp-tutor/mix-tutor.htm?search=700053(剑桥,新概念等教材)
用it作 形式主语的that-从句有以下四种不同的搭配关系:
a. It + be +形容词+ that-从句
It is necessary that… 有必要…… / It is important that… 重要的是……
It is obvious that… 很明显……
例:It is significant for persons to learn English well !
b. It + be + -ed 分词+ that-从句
It is believed that… 人们相信……
It is believed that to get a high education degree that can lead to a better salary . 人们相信获得更高的学历水平可以得到跟更高的薪水。
It is known to all that… 众所周知……
It is known to all that the Beijing is the Chinese capital . 众所周知北京是中国的首都
It has been decided that… 已决定……
It has been decided that Sunny will hold the meeting and give a speech .已经决定让Sunny主持会议并发表演讲。
c. It + be +名词+ that-从句
It is common knowledge that… ……是常识 / It is a surprise that… 令人惊奇的是……
It is a fact that… 事实是……
It is a fact that the Taiwan Island belongs to China form thousands years ago.
d. It +不及物动词+ that-从句
It appears that… 似乎…… / It happens that… 碰巧……
It occurred to me that… 我突然想起……
It occurred to me that I have left my purse behind at home .
It's for sb.和 It's of sb.
1) for sb. 常用于表示事物的特征特点,表示客观形式的形容词,如easy, hard, difficult, interesting, impossible等:
It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2)of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如good, kind, nice, clever, foolish, right。
It's very nice of you to help me. 你来帮助我,你真是太好了。
It作为引导词,引导长句时候非常普遍,并且对于不会运用其他几个复杂的从句的英语学员来说,是展示语法功底的优势手段。基本句型按照套路即可全部掌握。
<上一篇 英式英语和美式英语的区别有哪些,是什么
评论