什么叫主语从句，引导主语从句的关联词有哪些?
什么叫主语从句，引导主语从句的关联词有哪些?
解答：在句中作主语的名词性从句叫主语从句，它对应的谓语通常用单数第三人称。判断主语从句的方法是找到主句的谓语，其前的从句就是主语从句。但主语从句也可后置，并用it作形式主语。例：That you are absent is a pity.=It is a pity (that) you are absent.你缺席太遗憾了。注意：当主语从句放在主语位置时，that不能省；如果后置，则that可省。
主语从句，即在复合句中充当主语成分的句子，例如
【That he
finished writing the position in such a short time】 surprised us
all，
他在很短的时间内写完作文让我们都很惊讶，此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此
That he
finished writing the position in such a short time
便是该复合句的主语从句。
引导主语从句的连词主要有：
从属连词：that whether
连线代词：who whoever whom whose what whatever which whichever
连线副词：when where how why
在主语从句中的引导词有哪些？主语从句有什么注意事项？
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 position 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 aident 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 aident.
（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 o cheats were there. (=The o 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.
what引导主语从句和which引导的主语从句有什么区别
what引导的是名词性的从句，在从句中what 做宾语；而which从句做主语时，which在从句中的成分大多是修饰，定语的成分。
主语从句连词有哪些?
that,whether,who,what,whatever等
if能引导主语从句吗
if 怎么能引导主语从句啊。
引导主语从句连词有that,whether,who,what,whatever等
what 引导的主语从句
What really matters is that she wore a pair of white shoes.(what做matters的主语)
真正重要的是,她穿了一双白色的鞋子。
whether or not能引导主语从句吗
能啊
Whether he passes the exam or not is unknown.
whether不管是引导主语从句还是宾语从句都是不确定的事情。
能引导宾语从句的基本上能引导主语从句，主宾性质是一样的，都是名词性的。
