主语从句引导词怎么用，做什么成分用哪个？指人用哪个？指物用哪个？
主语从句引导词怎么用，做什么成分用哪个？指人用哪个？指物用哪个？
主语从句就是用引导词引导一个从句，整个从句在主句中做主语。指人用who，物用what，原因用why。如果不知道用哪个，你可以先想一下如果你想对主语部分提问，相应的特殊疑问句会用什么代词来引导，那也就是主语从句的引导词。
关系代词在从句中做表语,指人时用哪些引导词,指物使用哪些引导词
指人用who和whom【whom是宾格】；
物用which，人物都能用that，就这几个词。
定语从句有哪些引导词什么时候该用哪个不该用哪个
定语从句有很多种，引导词很多，如what, that, where,who/whom,which
修饰地点时用where, The place where I lived early is my hometown.
修饰物品时一般用that，what 或者which,根据具体情况判断，The apples that/what I bought are stll fresh. There are some chairs here, some of which are broken.
修饰人物时，一般用who 和whom, 用who 时，所修饰成分在从句中可以是主语或者宾语,如 The person who I saw in the street yesterday is my teacher. The person who is wearing glasses is my brother. 用whom时，所修饰成分在从句中必须是宾语。上面的句子The person who /whom I saw in the street yesterday is my teacher.所以一般情况下，都用who比较保险。
定语从句中there be句型用哪个关系介词指人和指物
定语从句中出现there be句型，要用关系代词that来指人和指物。例如：
There is a house that has bay windows.
有一幢房子有突出的窗户。
There is a man at the door that wants to see you.
有位男士在门口想要见你。
There are five rules that are to be observed.
有五条规则需要遵守。
定语从句中指物做主语用哪个不定代词
同学 ，不是不定代词，是关系代词，可以用which 也可以用that。南昌环球雅思为您解答 满意请采纳
主语从句引导词在句子中可做哪些成分
可以做主语 、宾语、表语、等
who和whom引导的主语从句不知道什么时候用哪个。。
who和whom：who在名词性从句中做主、宾、表成分,whom在名词性从句中做宾、表成分；who和whom引导的名词性从句指“事”
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 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
l don t know后用哪个引导词
I don't know if it is correct. 我不知道这是不是真的
I don't know what to do. 我不知道干什么
I don't know who he is. 我不知道他是谁
I don't know whether the story is real or not. 我不知道这故事是否是真的
I don't know why you are here. 我不知道你为什么在这
I don't know where to go. 我不知道该去哪
I don't know when the party will begin. 我不知道派对什么时候开始
I don't know how to solve the problem. 我不知道怎么解决这问题
这些都可以跟在I don't know 后面 关键是看语意 而不是“I don't know”
