高三表语从句讲解知识讲解
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表语从句讲解
一．定义：
表语从句就是用一个句子作为表语。位于系动词之后，说明主语身份，特征，属性或状态。比较：
The problem is puzzling.
主语连系动词形容词作表语
The problem is when we can get a pay ri.
主语连系动词一个句子作表语---表语从句
结构：主句+系动词+表语从句
二、系动词的分类（了解哪些词为系动词）系动词有表示状态的；有表示状态变化的。
表示状态的有：
1）be, em ,appear 等。
2）look ,sound ,feel ,taste ,smell 等，由感官动词变化而来。追悼词
意思“看（听、摸、尝、闻）起来”。
Mr. Li looks quite young. 李先生看起来很年轻。
3）stand ,keep ,prove ,remain 等由不及物动词转化而来。
The machine has been standing idle. 这台机器一直闲着不用。
2.表示状态变化的：
become ,get ,grow, fall, turn等He has fallen ill. 他已经病倒了。
三连接表语从句与主句的关系词主要有三类：
1. 从属连词：that（无有词义，不可省略）, whether是否,if （不能引导表语从句）
2. 关系代词：who（主格）whom（宾格）,who（所有格what（什么）,which （哪个，哪些）
3. 关系副词：when（什么时候）where（什么地方）why（为什么）, how（怎样）例如：
The fact is that we have lost the game. 事实是我们已经输了这场比赛。
That's just what I want. 这正是我想要的。
This is where our problem lies. 这就是我们的问题所在。
That is why he di二月英语
dn't come to the meeting. 那就是他为什么不到会的原因。
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It looks as if it is going to rain. 看上去天要下雨了。
It is becau you eat too much那是因为你吃得太多了。
The reason why he was late was that he misd the train by one minute this morning （当主语是reason时，表语从句要用that 引导而不是becau）
另外，与其他名词从句有所不同的是as, as if/though, becau 也可用来引导表语从句.如：
He looked just as he had looked ten years before. 他看起来还与十年前一样。
She ems as if she had done a great thing. 她看起来好像做了一件大事。
It is becau you eat too much. 那是因为你吃得太多了。
【注意】becau 可引导表语从句，但与之同义的since, as, for 等也不用于引导表语从句。
四注意事项（重点看）
1. 表语从句要用陈述语序。如：
That is where the famous scientist was born.
This is why she is so happy today
2. that和what在引导的表语从句
That本身没有词义，在句中只起连接作用，不充当句子成分；
what则表示“所……的（人或事）”，在表语从句中充当主语或宾等。
如：That fact is that more than venty percent of the earth's surface is covered by water.
What he told you was what had been discusd at the meeting.
3. If 与whether
均意为“是否”引导表语从句时，只能用whether, 不能用if。如：The question is whether we can finish our work by tomorrow evening.
4 语气1）主语为advice, order, idea, notion, proposal, suggestion, request等一些表示“建议、劝说、命令”的名词，之后的表语从句中，谓语动词用虚拟语气。s努力学习的诗句
hould+动词原形表示，should可省略。如：My
suggestion is that we (should) start early tomorrow. 我的建议是我们明天一早就出发。
Our only request is that this should be t月夜作文
tled as soon as possible.
我们唯一的请求就是尽快解决这个问题。
2 As if/though引导的表语从句时，从句谓语多用虚拟语气。因为从句中的情况与事实不相符。
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精品文档具体来说，如果从句表示与现在事实相反，谓语动词用一般过去式；与过去事实相反时，谓语动词
动词原形，如：如果从句表示将来的可能性不大，用would(might ,could )+“had+done”，Li Lei is now in a new jacket he looks as if he were an American boy. The girl is giving us a vivid description of moon. It ems as if she had been to the moon many times.
引导的表语从句所表示的与事实相符，从句则用陈述语气，如：但是，如果as if ,as though
The clouds are gathering. It looks as if is going to rain.
不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。5 时态
yesterday. criedis why he The q乡情作文600字
uestion The question is who will travel with me to Beijing tomorrow.
记住两个句型6
he reason is that
T．A 理由是他没有赶上公共汽车。The reason is that he didn't catch the bus.
例如：reason the “That ”同义，只不过从语法结构上讲，“That ”与“That
is the reason
例如：去掉则与“That ”结构一样，”中why引导的是—个定语从句，将其中的the reason
这就是我不能同意的理由That is (the reason) why I cannot 薯片沙拉
agree.
）（becauB．That is why 引导的名词性其中why意为“这就是……的原因/因此……”，常用句型，
那就…That is why he came late. 该句型通常用于针对前面已经说明过的原因进行总结从句在
句中作表语，是他晚的原因。那是因为他没有赶上公共汽车。That is becau he didn't catch the bus. 也是个常用That 意为“这就是为什么……/因为……”。“That ”与“That ”之间的不同在句型，
“That ”则指由于各种原因所造成的后果于“That ”指原因或理由，her homework.
with help his little sisternight. That is becau he had to He did not e the film last
)
第二句话说明原因那是因为他得帮助他的妹妹做作业。(第一句话说明结果，昨天晚上他没有去看电影，
因他以前曾看过那部电影， He had en the film before. That is why he did not e it last night.)
第二句话说明结果(第一句话说明原因，此他昨天晚上没有去看。练习1. The question is
________ we will have our篮球架怎么画
sports meet next week.
A. that
B. if
C. when
D. whether
2．The reason why he failed is ________he was too careless.
A. becau
B. that
C. for
D. becau of
3. Go and get your coat. It' s ________you left it
A. where
B. there
C. there where
D. where there
4．The problem is _________to take the place of Ted
A. who can we get
B. what we can get
C. who we can get
D. that we can get
5. What I want to know is ______ he likes the gift given by us.
A. that
B. if
C. whether
D.不填
6. The reason is_________I misd the bus.
