Transcript 微课件

对象：高一年级学生
制作：江西省龙南中学李庆娟
一、表语从句的定义：表语从句在复合句中作主句的
表语。表语从句和主语指同一内容，它对主语进行
解释、说明，使主语的内容具体化。
二、表语从句的表现形式
1.由从属连词引导。如：“that”,“whether”
The question is whether we should ask them for help.
The trouble is that he has never done the work before.
2.由连接代词引导。如：“what” “who”“whom”“whose” “which”
Guilin is not what it used to be.
What she wants to know is which dress she should buy.
3.由连接副词引导。如：“when”“why”“where”“how”“because”
That is where Lu Xun used to live.
That is why he didn’t pass the exam.
4.另可由as if ,as though引导。如：
It looks as if it were going to rain.
一些引导词的用法（一）
that在表语从句中 既不充当成分 ,又
。
没有意义
The fact is that he hasn’t yet recover from illness.
The reason why he has to go is that his mother is ill in bed.
比较 that在定语从句中的用法。
There are some films that I’d like to see.
She is the only student that knows French.
结论:that 在引导定语从句时,指事物,也可指人,
在从句中作主语或宾语,作宾语时常可省略。
一些引导词的用法（二）
What 在表语从句中充当
句子成分
什么，什么样子，什么样子人或事
表示
.
1. The question is what caused the accident.
2. That mountain is not what it used to be .
3. What he told you was what had been discussed at the
meeting.
另： what 不引导定语从句
一些引导词的用法（三）
• whether在表语从句中表 “是否”
,但不充当句子
的成分。if 不能 引导表语从句.如:
What the doctor really doubts is whether my mother
will recover from the serious disease soon
一些引导词的用法（四）
由as if
引导表语从句时要注意语态.若从句表示
与现在事实相反,谓动用
一般过去式（be用, were）
与过去事实相反用
had+p.p.
1. Li Lei is now in a new jacket. He looks as if he were an
American boy.
2. The girl is giving us a vivid description of the moon. It
seems as if she had been to the moon many times.