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(共16张PPT)
主语从句
Subject Clause
试比较
His words annoyed the boss.
→What he said annoyed the boss.
A bicyclist should wear a helmet.
→Whoever rides a bicycle should wear a helmet.
从以上例句可以看出，主语从句即一个完整的句子充当另一个句子的主语，作用相当于一个名词词组。
It is known to all.
Light travels faster than sound.
That light travels faster than sound is known to all.
连接词
主语从句
连接词的作用：
1.连接作用
2.在从句中充当或不充当成分
连接词
1.连词that引导的主语从句
2.what, who, which, whose等疑问代词引导的主语从句
3.whoever, whichever等连接代词引导的主语从句
4.when, why, where, how疑问副词引导的主语从句
5.whether引导的主语从句，表示“是否”
1.连词that引导的主语从句
That he survived the accident was a wonder.
=_____________________________________
It was a wonder that he survived the accident.
it充当形式主语
that从句后置
主语从句中的that：连接作用，不充当任何成分，没有实际意义
It 充当形式主语(主语从句后置)的三种常见形式：
（1）It+be+形容词/名词+that从句
（2）It+be+动词过去分词+that从句
（3）It+动词+that从句
例
例
例
It is possible that he has lost confidence.
他可能已经失去信心了。
It is reported that a strong snowstorm claimed six lives and injured 500 in Japan last week.
据报道，在上周日本的一场暴风雪中有6人丧生，500人受伤。
It turned out that the method didn’t work at all.
结果证明那个方法根本行不通。
2.what, who, which, whose等疑问代词引导的主语从句
what
who
which
whose
What he saw and heard during the trip impressed him.
他在这次旅途中的所见所闻给他的印象很深刻。
Who will be elected president isn’t clear now.
谁会当总统，现在还不清楚。
Which of them will be elected monitor of our class makes no difference.他们中谁当选为我们的班长没什么差别。
Whose fault it is doesn’t matter.
是谁的过错没有关系。
3.whoever, whatever等连接代词引导的主语从句
whoever
whatever
Whoever wins the presidential election will run into the same problems.
不论谁在这次总统大选中获胜都会遇到相同的问题。
Whatever is worth doing at all is worth doing well.
凡是值得做的事情都值得做得做好。
4.why, where, how, when等疑问副词引导的主语从句
why
where
how
Why he canceled the visit isn’t known.
他为什么取消这次访问还不清楚。
Where students are placed depends on what they want to study.学生被安排在何处取决于他们想学什么。
How he managed to collect enough funds in such a short time was unknown.他怎样在这么短的时间内筹集到足够资金还不清楚。
5.whether引导的主语从句，表示“是否”
whether
Whether a products sells well or not depends on its quality.
一个产品是否畅销取决于它的质量。
主语从句中的whether：连接作用，不充当任何成分，有实际意义“是否”，放句首不用if
单项选择
_________ is still unknown.
A. Whether he can attend the meeting
B. Whether can he attend the meeting
C. If he can attend the meeting
D. If can he attend the meeting
A
句意：他是否出席会议还不知道。
解析：疑问句在从句中都用陈述句词序，位于句首时只能用whether表示“是否”。正确答案为A
单项选择
2.It is still under discussion _________ the old bus station should be replaced with a modern hotel or not.
A. whether
B. when
C. which
D. where
A
句意：是否用一座现代化的宾馆来替代旧车站还正在讨论中。
解析：本题考查主语从句。Whether or not或whether…or not可用来引导名词性从句。正确答案为A。注意：whether可用于动词不定式之前、介词之后、名词之后，可引导主语从句、表语从句等；而if不可
单项选择
3. _________ some people regard as a drawback is seen as a plus by many others.
A. Whether
B. What
C. That
D. How
B
句意：被很多人视为缺点的东西，被另一些人看作是有利因素。
解析：此处what引导主语从句并在从句中作宾语。正确答案为B。
单项选择
4. _________ Mr. Smith comes from is still a puzzle to us.
A. Whether
B. Where
C. When
D. How
B
句意：史密斯先生是哪里人对我们来说还是个谜。
解析：where表示地点。正确答案为B，容易误选A。
单项选择
5. _________they were in the reading room that day.
A. It happened that
B. It was happened that
C. That happened
D. It happened to
A
句意：碰巧那天他们在阅览室。
解析：句型It happens/ happened that的意思是“碰巧……”，it为形式主语，that之后的从句是真正的主语。正确答案为A。
单项选择
6. _________that not all of these dictionaries are useful.
A. It seems to me
B. In my opinion
C. I think in my mind
D. I seem
A
句意：在我看来这些词典并非都有用。
解析：只有A和C才能接句子，但C不合英语习惯，像汉语式英语。正确答案为A。

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