It的用法复习讲义-高三英语一轮复习.docx

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1、It的用法总复习一、用于表达天气、环境、时间、距离、季节等。例如：1) Its warm and sunny here.2) Its half an hours walk from here to my company.3) Its ten oclock now and its time for bed.二、用于代替上文提到过的人或事物。指代人时，一般是指小孩或身份不太明确的人。例如：1) -Who is the baby? -Its my teachers son.2) -Hi. Is it Mr. Chen speaking? -No. It is John speaking, the a

2、ssistant of Mr. Chen.三、用作形式主语，没有具体意义。（注意：真正的主语在句子后尾，避免句子“头重脚轻”的情况，而这类移去句子后尾的主语有三种形式：不定式动名词从句）A. 动词不定式短语a) It is kind (of sb.) to do sth.本句型中的不定式如果需要逻辑主语，则须加上前置介词of，而句型中的形容词必须是能表示逻辑主语特征的形容词，常见的有bad, brave, careless, clever, foolish, honest, cruel, horrible, kind, lazy, modest, polite, rude, wise, wro

3、ng等。b) It is necessary (for sb.) to do sth.c) It is up to sb. to do sth.表示“宜由某人做.”。d) It is (just) like sb. to do sth.表示“某人（恰恰）是.样子”，一般用来表示赞扬或不满，若用否定式，则表示怀疑。例如：Its like him to always stand others up. 他就是这样的一个人，总是放别人鸽子。B. 动名词短语以动名词短语作主语的句子，主要出现在以no good, no use, no harm, dangerous, foolish等词作表语的句子中。例

4、如：Its no use crying when you get into trouble.C. 替代从句a) It is a pity/a shame/a fact/a wonder. +that.b) It is time/about time/high time that.本句型中that后的从句要用虚拟语气。c) It is/will be the first/second.time that sb. have done sth.It was the first/second.time that sb. had done sth.d) It is said/reported/learn

5、ed. that.e) It is strange/surprising/obvious/true/good/possible/clear. that.f) It seems/happened/turned out. that.g) It is suggested/ordered. that.本句型中的过去分词要为表示请求、建议、命令等的词，that后的从句要用虚拟语气（should+动词原形），should可以省略。四、用作形式宾语。当复合宾语中的宾语为不定式、动名词或从句，常用it作形式宾语，而将真正的宾语移到句末。例如：1) We find it difficult to learn E

6、nglish well in such a short time.2) You should make it clear when and where you are going to have the meeting.五、用在强调句中，即“It is/was +被强调部分+that/who/whom+其它”句型。注意：1) 强调句的谓语is/was永远用单数。2) 不管被强调部分是哪种状语，都只能用that连接，不能用where、when等连词。3) 被强调部分为人时，可用who（主格/宾格）和whom（宾格）代替that，也可仍用that。例如：It was your father tha

7、t/whom/who I met in the street yesterday.（强调人）It was yesterday that I met your father in the street.（强调时间）It was in the street that I met your father yesterday.（强调地点）4) 强调句中要注意主谓一致、人称一致和否定转移的问题。例如：It is they who are our friends.5) 注意不要混淆强调句和其他从句。It is/was.that.为强调句标志，去掉后依然可以组成一个完整的句子，而其他从句一般不具备这一特征。对比：It was ten oclock when we got home last night.It was at ten oclock that we got home last night.学科网（北京）股份有限公司