Unit 5 语法精讲：主语从句＆it 作形式主语的主语从句 ppt课件 -（2019）新人教版高中英语选择性必修第一册.pptx

1、语法精讲： 什么是主语从句什么是主语从句 在主从复合句中，充当主语的从句是主语从句。它是名词性从句之 一，使用陈述句语序。 引导的连接词有从属连词、连接代词和连接副词。 用法归纳用法归纳 引导主语从句只起引导作用，在主语从句中不充当任何成分。 例：That price will go up is certain. Whether we go by train or by boat makes no difference. 1. 从属连词： that、whether 、 if 在句中不仅起连接词的作用，并充当句中的主语、宾语或表语。 2. 连接代词: who、whoever、whom、whose

2、、what、whatever、which、whichever 例：What India needs is a law to make land ownership fairer. Who will be the president is still unknown. 用法归纳用法归纳 引导名词性从句时不仅起连接词的作用，也在句中作状语。 When well start tomorrow will be told soon. Why he came here is not known. 3.连接副词：when、where、how、why 用法归纳用法归纳 为了避免主语冗长，句子头重脚轻。经常用

3、it 作形式主语。 例：That the earth is round is known to all. =It is known to all that the earth is round. 4. it作形式主语 用法归纳用法归纳 1. 主语从句作主语时，谓语多用单数； 2. what引导的主语从句，可根据表语决定主语动词的单复数。 例：Whether Mary came or not is none of your business. What you said is of great importance. What you left are several books. 5. 主语从

4、句的主谓一致 1. _ he made an important speech at the meeting was true. 解析：主语从句中，不缺成分，用that引导。 语法填空。语法填空。 考点追击考点追击 That 2. _ is known to us all that America is a developed country. 解析： that America is a developed country是真正的主语 从句，句首用it充当形式主语。 It 语法精讲 it作形式主语的主语从句作形式主语的主语从句 e.g. Itsapitythatyoumissedtheexci

5、tingfootballmatch. 由于主语从句过长，为了避免头重脚轻，常 用it作形式主语，而把主语从句放在句末。 句型精讲句型精讲 clear, obvious, likely, probable, surprising 句型一 形容词 1. It + be +形容词+主语从句 做.是.的 例：It was surprising that she passed the difficult exam. It is not clear whether he told a lie. 句型精讲句型精讲 句型一 此句型中的形容词是important， necessary等时，从句应该使用虚拟语气。

6、 例：It is important that we (should) learn English well. 句型精讲句型精讲 said, reported, believed, thought, announced 句型二 过去分词 2. It + be+过去分词+主语从句 据. 例：It is said that they are identical twins. It is reported that a big earthquake hit the area. 句型精讲句型精讲 句型二 如果过去分词是suggested, ordered, required, advised, req

7、uested等表示 建议、要求、命令等词时，从句应该使用虚拟语气。 例：It is suggested that students (should) make their bed by themselves. 句型精讲句型精讲 pity, honor, good idea, fact, good news 句型三 名词 3. It +be +名词+主语从句 做.是.的 例：It is a pity that he missed such an interesting film, It is good news that he has recovered. 句型精讲句型精讲 seem, happ

8、en, appear, look, occur, turn out 句型四 不及物动词 4. It+不及物动词+主语从句 例：It happened that they were out that day. 碰巧那天他们不在家。 句型精讲句型精讲 worry, shock 句型五 及物动词 5. It+及物动词+宾语+主语从句 例：It shocks me that he failed in this exam. 他没通过考试，震惊到我了。 1. _is a fact that English is being accepted as an international language. 解析： 本题考查“It+be+名词+that的主语从句”，其中it位于句 首作形式主语。 语法填空。语法填空。 考点追击考点追击 It 2. It is uncertain _ he can come to Jennys birthday party or not. 解析： 在主语从句中不缺成分，缺少“是否” 的概念，用 whether。 whether Bye-bye!