b4u4 grammar 学案必修四语法主语从句

Book4Unit4 Grammar (高一)
Self-study 划出下面句子的主语,并思考它们有什么共同点
1) That he will succeed is certain .
2) Whether he will go there is not known .
3）What he said is not true .
4) How we can help the twins will be discussed at the meeting.
5) It is important that we should study hard.
思考：1. 什么是主语从句？ 2. 有什么引导词可以引导主语从句？
3.主语从句太长时一般如何处理？
4.主语从句的数和语序是怎样的？
Subject Clauses
1.什么是主语从句
主语从句就是从句在主句中作主语的名词性从句。

How we can help the twins will be discussed at the meeting.
2. 引导主语从句的引导词
1) _______she left him hurts him so much. 她离开了他，这深深地伤害了他。

由______引导的主语从句. (_______没有实在意义,不充当句子成分,不能省.)
2) ________ we will begin the meeting is clear. 我们什么时候开会是清楚的。

由___________________引导的主语从句.
(用who，whom，which，whose，what，when，where，why，how，whoever，whatever 等词引导的主语，引导词都在从句中充当一定的成分，包含意思，不能省略。

注意句子要用陈述语序。

)
3) __________ I can pass the exam is unknown.. 我能否通过考试还是未知。

由whether引导的主语从句。

（whether不充当句子成分，表示“是否”，一般可以和or，or not 连用。

但if不能引导主语从句放在主句句首。

）
3. 主语从句太长时一般如何处理？
That he will late for school is impossible.
_______________________________________
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______作_________, 而把从句放在后面。

这样就构成了下面一些常用句型:
1) It +be + n. +从句
It is a pity that... 遗憾的是……It is a surprise that…令人惊奇的是…
It is a fact that……是事实
*__________________(很遗憾)we lost the match.
*_________________(这是事实)he cheated in the exam.
2) It +be + adj. +从句
It is 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…
*____________________(很可能)she will come back tomorrow.
*____________________(很明显)this measure is effective.
3) It +不及物动词(seem/happen/occur) +从句
It happened that... 碰巧……It occurred to me that…我突然想起…
It seems that…. 似乎…
*___________________(刚好)I came into the office at that time.
*_______________________(我突然想起)I forget to sent the letter.
4) It +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……
*______________________(据报道)20 people were killed in the accident.
*________________________(建议)we should eat more vegetable and do more exercise.
4.主语从句的数和语序
a. When will the meeting begin?
b. It has not been decided. （合并句子）
___________________________________ has not been decided. 从句用________语序Whatever he says is of no importance.
主语从句作主语时，主句的谓语动词一般用_______数。

（但谓语动词用单数还是复数，不可一概而论，而要视句子的意义而定
What I need is money. What I need are books.）
what 与that在引导主语从句时的区别
what引导名词性从句时在从句中充当句子成分,如主语,宾语,表语,
而that则不然,它在句子中只起连接作用。

例如：
1. What you said yesterday is right.
2. That she is still alive is a puzzle.
1)________ she is still alive is a consolation（安慰）.
2)_______ he lost the bike worried him a lot.
3)________ caused the accident remains unknown.
Practice：
1.________ we need is more time.
2._________he said at meeting is important.
3.________ he can pass the exam remains a question.
= It remains a question _________he can pass the exam.
4._________we’ll go camping tomorrow depends on the weather.
5._________we will have an exam next month has been announced.
6.我们需要的正是他的勇气和诚实。

_____________________________is his bravery and honesty.
7.他什么时候来公司还不清楚。

____________________________is still unknown.
8.昨晚发生了什么仍然是个迷。

_________________________is still a mystery.
(合并句子)
9.He hadn’t said anything. It surprised us.
10.How was the building built? It is still a mystery.
11.When he will be back? It depends on the weather.
12.We should keep a balanced diet. It is important.。