主语从句讲解

(3). 连接副词 when(时间), where(哪里), why(为什么), how(怎么；如何)有词义，在从句中担任状语。 Why Chen Lin committed suicide has not been clear yet. How this happened is not clear to anyone. Where he found the treasure remains a mystery. When we will hold the graduation ceremony has not been decided yet. When they will leave is not decided.
(四). 判断以下句子是否正确： They should like each other is natural. 错误 That they like each other is natural. 正确 It is natural that they like each other. 正确
That引导的主语从句放句首，既不充当成分又无意义， 但that不能省去。
+(should) +do…
It is possible that 很可能)she will come *_________________( back tomorrow. *_________________( It is obvious that 很明显)this measure is effective.
Which plan is better should be discussed. Whoever comes to China is welcome. Whatever you do in your spare time should do no harm to others.
Whoever breaks the law will be punished.
3) It + be +过去分词+从句
It is said that... 据说…… It is known to all that... 众所周知…… It is reported that... 据报道…… It is believed that...据信……;人们相信…… It is suggested that + (should）do... 建议…… It must be admitted that…必须承认…… It cannot be denied that… 不可否认…… It must be pointed out that…需指出的是……
(二). 谓语动词的单复数
has When we shall hve our sports meeting ____(have) not been decided yet. What I need ____(be) money. is What I need _____(be) books. are have When they will start and where they will go _____(have) not been decided yet. When and where the meeting will be held _____(have) not has been decided.
4) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起… It happened that 刚好)I came into the office at that ________________( time. ____________________( It occurred to me that 我突然想起)I forget to sent the letter. 5) It + 及物动词+宾语+that从句 It worried her a bit that her hair was turning grey. It shocked me that he didn’t tell anybody where he was.
x
are
(4). 连接代词：who(谁，主格); whom(谁；宾格); whose(谁的); what(什么…事/话…); which(哪一个); whoever(无论谁), whatever(无论什么), whichever(无论哪一个) 在句子中担任主语， 宾语，表语或定语
Who will host the meeting hasn’t been decided yet.
(2). 连接词 whether 在句中不充当成分，意为“是否” Whether we go by train or by boat makes no difference. Whether life exists on other planets is not clear. Whether he’ll come here isn’t clear. Whether the old bus station should be replaced with a modern hotel or not is under discussion.
这样就构成了下面一些常用句型: 1) It is + n. +从句 It is a pity/shame that... 遗憾的是…… It is a surprise that…令人惊奇的是… It is a fact that… …是事实 It is common knowledge that… …是常识 It is a pity that 很遗憾)we lost the match. *_______________(
Grammar
Grammar
名词性从句包括：
宾语从句：介宾结构；动宾结构
表语从句：系表结构(系动词后面跟一个从句)
主语从句: 一个句子做主语
同位语从句：对名词进行解释说明
判断下列从句： 1.China is no longer what she used to be. 2.The question remains whether they will be able to help us. 3.It seemed as if I couldn't think of the right word. 4.The reason why I study hard is that I want to go to a key university. 表语从句 5.They believe in that she must still be single. 6.I know nothing about him except that he is living in Beijing 7. I don’t know whether he’s free or not. 8. Mary asked whether I was doing my homework or not. 9. I’m thinking of whether we should go fishing. 10. We are worried about whether it will rain tomorrow. 宾语从句
It is a fact that 这是事实)he cheated in the *______________( exam.
2) It is + adj. +从句 It’s certain that… 肯定… It is possible that... 很可能…… It is unlikely that... 不可能…… It is obvious that… 很明显… It is necessary \important \natural\... that…
主语从句能用it做形来自百度文库上的主语(二)
注意: 由that 引导的主语从句有时为了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形式主语, 而把从句放在 后面。 例如: *it为形式主语
1. That he will refuse this piece of advice is impossible. It is impossible that he will refuse this piece _______________________________________ of advice. _______________________________________ 2.That they should like each other is natural. It is natural that they should like each other. _____________________________________
4. That is certain that we can win. It
5. It is ordered we should leave at once. that 6. Where he comes from are a is mystery. 7. What whether he likes the job is not clear. 8. Who he is and where he is from is are important. 9.What he saw is the stars in the sky.
找出错误，并给出理由： 1.Where shall we spend the holiday isn’t decided. we shall 2.You have made a mistake is a fact. That you have 3. If the policeman will come is not certain. Whether
主语从句中应注意的问题
(一). 语序应是陈述句语序
How he managed to survive in the forest interested everyone present. When he will come is not known. What he needs is an English dictionary.
(三) if/wheter 在主语从句中的用法
If the meeting will be put off has not been decided yet.
Whether the meeting will be put off has not been decided yet.
注意：whether 可以引导主语从句可以放在句首， 但if不能
(1). 连接词：that 在句子中不充当任何成分，无意义， 不可省略 That he will win is certain. That he got the first prize made his parents very happy. That China has become strong is certain. That they love each other is obvious. That he played computer games into night made his parents disappointed.
It is reported that 据报道)20 people were *___________________( killed in the accident. It is suggested that 建议)we should eat *______________________( more vegetable and do more exercise.