各类从句的引导词？比如定语从句的引导词..... 主语从句的引导词......等等

主语从句引导词都有哪些？~

引导主语从句连词有that,whether,who,what,whatever等
宾语从句：多为that,可以省略
表语从句：be动词的改变形势
定语从句：that,who,whom,whose,where,when,which...
状语从句：that,when,where等可以表示状态的疑问词等

主语从句(Subject Clause)

定义:如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句.

第一部分：常规主语从句，即句子在复合句中充当一个主语

（1）That he finished writing the composition in such a short time surprised us all.

（2）Whether we will go for an outing tomorrow remains unknown.

（3）Who will be our monitor has't been decided yet.

（4） Whom we must study for is a question of great importance.

（5）What caused the accident remains unknown.

（6）Whatever you did is right.

（7）Whose watch was lost is unknown.

（8）What we need is time.

（9）What we need are good doctors.

小结:

（1)引导主语从句连词有that,whether,who,what,whatever等

（2)连词位于句首不能省略

（3)主语从句大多数情况下视为单三,但也有例外,如例9

第二部分：为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末

（1）It is certain that he will win the match.

（2）It is true that he has made a very important discovery in chemistry.

（3）It is very likely that they will hold a meeting.

（4）It is strange that he should do that.

（5）It is important that we all should attend the meeting.

（6）It is strange that the man should have stuck to his silly ideas.

（7）It is a pity that we won't be able to go to the south to spend our summer vacation.

（8）It is still a mystery what caused the accident.

（9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai)

（10）It is known to all that the gun powder was first invented by the Chinese.

（11）It is suggested that the work should be done with great care.

（12）It seems that he has seen the film.(=He seems to have seen the film)

（13）It happened that the two cheats were there. (=The two cheats happened to be there)

小结:

（1)以that 引出的主语从句,常以形式主语it引导. It is +形容词/名词/某些动词ed + that 从句.

（2) 在有些that从句中要用虚拟语气 (should+do/should+have done)例句4,5,6,11

1.在there + be的句型中，句子的主语是先行词，而且又是物。
例如：
There are two novels that I want to read.我要读的有两本小说。
There is no work that can be done now. 没有什么工作现在能做的了。
2.当先行词为主句的表语或者关系代词为从句的表语时。
例如：
This is the book that was bought yesterday.这就是昨天买的书。
Our school is no longer the school that it used to be. 我们的学校不再是以前的学校了。

3.以Here is (are)开头的句子时。
例如：
Here is a film that will move anyone.这是一部将使任何人受感动的电影。
Here are two books that I will buy.这是我要买的两本书。
4.It is (high)time +定语从句中。
例如：
It is time that we should have a rest.我们应该休息了。
It is high time that they started out. 他们该动身了。
5.当先行词是way等词时，关系代词用that在定语从句中作方式状语时，在口语中，常可省略。
例如：
She admired the way in which I answered the questions.她羡慕我回答问题的方式。

引导名词性从句的连接词可分为三类：　　
连接词：that, whether, if (不充当从句的任何成分）
连接代词：what, whatever, who, whoever, whom, whose, which.
连接副词：when, where, how, why
不可省略的连词：
1. 介词后的连词
2. 引导主语从句和同位语从句的连词不可省略。
That she was chosen made us very happy.
We heard the news that our team had won.
whether 与 if 均为 “是否” 的意思。但在下列情况下，whether 不能被 if 所取代：
1.whether 引导主语从句（包括从句在句首的位置）应当用whether，不用if，如：
Whether it is true remains a problem.
Whether he will come, I am not sure.
2. 引导表语从句用whether，不用if，如：
The question is whether you should accept it.
3. whether可以引导从句作介词的宾语，而if 则不能，如：
I’m not interested in whether they’ll go or not.
It depends on whether we have got enough money.
4. whether可以直接跟动词不定式连用，而if 则不能，如：
I didn’t know whether to laugh or to cry.
She hasn’t decided whether to go or not.
5.引导同位语从句用whether，不用if，如：
The question whe大部分连接词引导的主语从句都可置于句末，用it充当形式主语。
It is not important who will go.
ther he’ll attend the meeting is essential.
1）由从属连词that引导的从句叫做名词性that-从句。that只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。
名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语，例如：
用 it 作形式主语的that- 从句有以下四种不同的搭配关系：
a. It + be +形容词+ that-从句
　It is necessary that…　　　 有必要……
　It is important that…　　　 重要的是……
　It is obvious that…　　　　 很明显……
b. It + be + -ed 分词+ that-从句
　It is believed that…　　　　　 人们相信……
　It is known to all that…　　　 从所周知……
　It has been decided that…　　 已决定……
c. It + be +名词+ that-从句
　It is common knowledge that…　 ……是常识
　It is a surprise that…　　 令人惊奇的是……
　It is a fact that…　　　　 事实是……
d. It +不及物动词+ that-分句
　It appears that…　　　　　　 似乎……
　It happens that…　　　　　　 碰巧……
　It occurred to me that…　　 我突然想起
1）由wh-词引导的名词从句叫做名词性wh-从句。wh-词包括who, whom, whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词。wh-从句的语法功能除了和that-从句一样外，还可充当介词宾语、宾语补语和间接宾语等，例如：
主语：How the book will sell depends on its author.
直接宾语：In one's own home one can do what one likes.
间接宾语：The club will give whoever wins a prize.　
表语：My question is who will take over the president.　
宾语补足语：She will name him whatever she wants to.
同位语：I have no idea when he will return.　
形容词宾语：I'm not sure why she refused their invitation.　
介词宾语：That depends on where we shall go.
2）wh-从句作主语也常用先行词it做形式主语，而将wh-从句置于句末，例如：
　It is not yet decided who will do that job.　
1）yes-no型疑问从句
从属连词if, whether引导的名词从句是由一般疑问句或选择疑问转化而来的，因此也分别被称为yes-no型疑问句从句和选择型疑问从句，其功能和wh-从句的功能相同， 例如：
主语：Whether the plan is feasible remains to be proved.
宾语：Let us know whether/if you can finish the article before Friday.
表语：The point is whether we should lend him the money.
同位语：They are investigating the question whether the man is trustworthy.
形容词宾语： She's doubtful whether we shall be able to come.　
介词宾语： I worry about whether he can pass the exams.　　
2）选择性疑问从句
选择性疑问从句由关联词if/whether…or或whethe…or not构成,如：
Please tell me whether / if they are Swedish or Danish.
I don't care whether you like the plan or not.

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