内容正文:
Period 3
本单元的语法项目:名词性从句之表语从句
(Noun Clause-Predicative Clause)
一、什么是表语从句?
表语从句放在系动词之后,充当复合句
中的表语。表语从句(Predicative Clause)
就是指一个句子作为表语,说明主语是什么
或者怎么样,由名词、形容词或相当于名词
或形容词的词或短语和系动词一起构成谓
语。
二、表语从句的构成:
主语+系动词+引导词+简单句
例句:My idea is that we should do it at
once
我的想法是我们应该马上做。
The problem is how we can find him.
问题是我们如何找到他。
That's why I can't go with you.
那就是我不能同你一起去的原因。
It isn't as if you were going away for ever.
又不是你离开不回来了。
三、引导表语从句的关联词种类:
1.可接表语从句的系动词有be,look,
seem,sound,appear等。
例句:At that time,it seemed as if I could-
n't think of the right word.
当时,我似乎怎么也想不出一个恰当的
字眼来。
2.从属连词whether,.as,asif/though引
导的表语从句。
例句:It sounds as if someone is knock-
Unit1 SCIENCE AND SCIENTISTS
Grammar
ing at the door.
听起来好像有人在敲门。
The question is whether he is honest.
问题是他是否诚实。
3.because,why引导的表语从句。
例句:That's why he got angry with me.
那正是他对我生气的原因。(That's
why.强调结果)
It is because I love you too much.
那是因为我太爱你了。(It is because.
强调原因)
注意:名词reason作主语时,后面的表
语从句表示原因时要用hat引导,不宜用
because
例句:The reason why he always gets the
first prize is that he puts his heart into working
hard day and night.
他总是得一等奖的原因就是他夜以继日
地全身心投入到刻苦的学习中。
4.连接代词who,whom,whose,what,
which,.whoever,whatever,.whichever引l导的
表语从句。
连接副词where,.when,how,why。
例句:The problem is who we can get to
replace her.
问题是我们能找到谁去替换她呢。
You can be whoever you want to be.
你可以成为你想成为的任何人。
5.从属连词hat引导的表语从句。
例句:The trouble is that I have lost his
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高中英语选择性必修第二册(人教版)
address.
麻烦是我把他的地址丢了。
6.使用虚拟语气的表语从句。
在表示建议、劝告、命令含义的名词后
的表语从句,谓语动词需用“should+动词原
形”表示,should可省略。常见的词有ad-
vice,suggestion,order,proposal等。
例句:My suggestion is that we(should)
start early tomorrow.
我的建议是我们明天一早就出发。
四、表语从句使用应注意的几个问题:
1.连词that的省略问题。
引导表语从句的that通常不省略,但在
口语或非正式文体中有时也可省略:
My idea is (that)we should do it right
away
我的意见是我们应该马上干。
The trouble is (that)he is ill.
糟糕的是他病了。
2.whether和f在引导宾语从句时有时
(12)学
是可以互换的,但引导表语从句时不能用f。
例句:My question is whether he left
(or not).
我的问题是他是否离开了。
What the doctor really doubts is whether
my mother will recover from the serious dis-
ease soon.
令医生怀疑的是我的妈妈是否能很快从
那场严重的疾病中康复过来。
3.当主句的主语为“reason”或者是由
“why”引导的从句时,与它们相关的表语从
句由“that”来引导,而不能用“because”
引导;“because”引导表语从句只能用于
“It/This/That is/was because.”句型中。
例句:The reason why I was late was that
I missed the train.
我迟到的原因是我错过了火车。
I was late.It was because I missed the
train.
我迟到了。那是因为我错过了火车。