高考英语语法表语从句重点解析及高考真题

一些引导词的用法（二）

What 在表语从句中充当主语、宾语或表语
表示
什么，什么样子，或所……的（人或事）
.
1. The question is what caused the accident.
2. That mountain is no longer what it used to be .
3. What he told you was what had been discussed
与过去事实相反用 had+p.p.
或表示将来
的可能性不大，则用 Would(might,could)+v原 .
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.
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.
比较在定语从句中的用法。
China is a country which has a history of 2000 years. A dictionary is a book which gives the meaning of words.
结论: which在引导定语从句时,指事物, 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（四）
当主句的主语为reason,或者是why由引导的从句时,
与它们相关的表语从句用_th_a_t_来__引__导_,而不能由_b_e_ca_u_s_e_
引导;
because 引导表语从句时只能用于
_I_t_/T_h_a_t_/T__h_is_i_s_/_w_a_s__b_e_c_a_u_se_…___ 句型中.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（六）
由as if ,as though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w,ere）
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高考英语语法知识点梳理系列
表语从句
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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.
at the meeting.
另： what 不引导定语从句
一些引导词的用法（三）
Which 在引导表语从句时,常充当定_语__,表__语________
表示其中哪一个
。如：
I read about it in some book or another,but
what I don’t know is which (book) it is.
4.另可由as if ,as though引导。如： It looks as if it were going to rain.
• The last time we had great fun was _____ we were visiting the Water Park. （2008天津卷）
The reason why I was late was that I missed the train.
I was late. It/That/This was because I missed the train.
一些引导词的用法（五）
• 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:
bed.
比较在定语从句中的用法。
There are some films that I’d like to see.
She is the only one among us 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。
• A. where
B. how
• C. when
D. why
表语从句两大要素:
1. 除that外的所有引导词都有自己的意义。
2. 除that,whether外的所有引导词都须在从句中充当相 应的成分。
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
3. It looks as if it might rain. 4. The clouds are gathering.it looks as if it is going to rain.
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