人教版高中英语必修三课件Unit4 Grammar（共28张PPT）

(共28张PPT)

Subject Clause
主语从句
Unit4 Grammar

01
02
03
04
05
定义
引导词
形式主语结构
语序及时态
主谓一致
Subject Clause
定义
/01
找出每个句子中的主语
1. Jane is good at playing the piano.
2. She went out in a hurry.
3. To see is to believe.
4. Smoking is bad for health.
5. What he has said is true.
Tips：（1）主语是句子说明的人或事物，一般放在______.
（2）在句子中充当_______的从句就是主语从句。
（名词）
（代词）
（不定式）
（动名词）
（从句）





句首
主语
That he will pass the exam is certain.
Whether he will pass the exam is uncertain.
Who will go makes no difference.
What we need is more time.
Which book I shall choose hasn’t been decided.





找出下列句子中的主语从句
语序和时态
/02
e.g.: 1. When will he come is not known.
Tips: 主语从句一律用陈述语序(主语+谓语)。
主语从句的时态受主句的时态影响和限制。
→ When he will come is not known.

2. That he finishes his work on time was a great surprise to us all.

→ That he finished his work on time…
主语从句的语序、时态
引导词
/03
9
从属连词that, whether；
连接代词who, whom, whose, what, which; wh + ever；
连接副词when, where, how, why。
主语从句的引导词
e.g.: That he will come is certain.
That they are badly in need of help is quite clear.
Whether he will come is uncertain.
Tips: _____在从句中不做成分，起连接作用，本身无意义，不能省略但主句内容表肯定。
________不做成分，起连接作用，意思是“______”， 不能省略但主句意思表不确定。
that
是否
1. 从属连词that 和 whether：
whether



(1)________ he made an important speech at the meeting was true.
(2)__________we’ll go camping tomorrow depends on the weather.
(3)_________ they will sell the house is not yet decided.
(4)________ she could come to help us made us very happy.

练习： 填空-从属连词(that, whether)
That
Whether
That
Whether
Who will go makes no difference.
What we need is more time.
Which book I shall choose hasn’t been decided.
Tips: 连接代词引导主语从句，在从句中可以作主语、
宾语、表语或定语。
2. 连接代词who, whom, what, which, whose



wh+ever词: whatever, whoever, whomever, whichever
e.g.: Whoever comes to our school is welcome.
Whatever he said wasn’t true.
Whichever book you choose is yours.

Tips: “wh+ever”与 “wh-词”的用法一样，只是语意较强，含有“凡是、无论……”之意，泛指任何一个，其引导从句时无疑问意义；
而“wh-词” 多有疑问意义。
练习： 填空-连接代词
（1） ________ will host the meeting hasn't been decided.
（2） ___________ comes to our school is welcome.
（3） ________ side will win is not clear.
（4）__________ I have is yours.

Who
Whoever
Which
Whatever
e.g.: When we will leave hasn’t been decided.
How she keeps healthy is a secret.
Why he cries is not clear.
Where the meeting will be held is not known.

Tips: 连接副词引导主语从句并在从句中作状语。

3. 连接副词when, where, how ,why




(1). ________ he didn’t come yesterday is still unknown.
(2). ______________ we will set up the factory should be
discussed.
(3). ___________ this happened is not clear.
(4). _____ Jack looked so excited is not clear.
Why
Why/How
When/Where
练习： 填空-连接副词
Why
根据主语从句中成分是否缺失和主句意义是否完整来选择相应的引导词。
总结
如何选择主语从句中引导词：
主谓一致
/04
主语从句中的主谓一致
(1). 单个主语从句做主语时，主句谓语动词用单数。
e.g.: When we will hold our sports meeting _____ (have) not been decided yet.
(2). 由两个或者多个引导词引导单个主语从句时，主句谓语动词用单数。
e.g.: When and where we will hold our sports meeting ____ (have) not been decided yet.

has


has
(4). 和表语一致的情况
(3). 由and连接两个或两个以上主语从句做主语时，主句谓语动词用复数。
e.g.: When they will start and where they will go ______ (have) not been decided yet.
have
主语从句中的主谓一致

e.g.: What I want is the book.
What I want are some books.
what 引导的从句做主语时，谓语的单复数取决它的________.
表语
What I need ___ money.
What I need ____ books.
is
are
形式主语结构
/05
→ It is certain that he will win the match.
e.g.: That he will win the match is certain.
注解：一般来说主语从句都是放在 ,
但有时为了使句子 ,避免”头重脚轻”,
常用 作 ，从而把主语从句放在
．
句首
保持平衡
it
形式主语
后面


主语从句中用it作形式主语的结构
形式主语
That we can’t go to see the movie is a pity.
It is a pity that we can’t go to see the movie.

形式主语
主语从句中用it作形式主语的结构
(1). It + be + 名词 ＋ that从句
It is a pity that… 很遗憾…
It is a fact that… 事实是…
(3). It + be + 形容词 ＋ that从句
It is obvious that…… 显然...
It is important that …. 重要的是…
(2). It + be + 过去分词 ＋ that从句
It is said that... 据说...
It is known that… 众所周知…
(4). It +不及物动词+that
It happened that... 碰巧……
It occurred to me that… 我突然想起…
形式主语常用句型
1.______________(是个惊喜)that he changed his mind.
2.______________(据推测) that she will come back tomorrow.
3.______________(有必要)that we should learn English.
It is a surprise
It is predicted
It is necessary
练习
主语从句和强调句型的区别：
e.g.: 1) It is a pity that Mr. Smith can’t attend the meeting.
2) It is better food and more sunshine that the patient needs.
(主语从句）
(强调句）
强调句型: “It is（/was）+强调部分+that (/who)…”.
判断是否为强调句：去掉It is（或was）…that（或who）…框架后，剩余部分为一个完整的句子。
1.(_____ is needed for success) is your hard work.
2.(__________ they will arrive )has been told to the teacher.
3.(_____ can join in the sport meet) is decided by the teacher.
4.(________ it will rain or not) is not clear.
6.(______ the earth is a solid ball) is known to us all.
What
When/How
Who
Whether
That
5. (____ the earth is becoming warm) is a good topic for research.
Why
7. (________ leaves the room last) ought to turn off the lights.
8. (__ )is our hope (that the two sides will work towards peace).
Whoever
It
巩固练习

Thanks