1、键入文字 1主语从句(Subject Clause)主语从句的用法主语从句与宾语从句两者的用法和在句中的作用是不同的，在句子中担当主语的是一个从句,这个从句就叫做主语从句。 。 从句时态不受主句限制：1.That he finished writing the composition 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 hasnt been decided yet.4. Whom we
2、 must study for is a question of great importance.5.What caused the accident remains unknown.6.Whatever you did is right.7.Whoever the watch belongs to was lost.8.What we need is time.9.What we need are good doctors.由上可见:1.引导主语从句的连词有 that,whether, who ,what, whatever 等。 2.句首的连词不可省略3.主语从句大多视为第三人称单数（有
3、例外，如 9.）为防头重脚轻，常使用 it 形式主语，如：1.That he will win the match is certain.It is certain that he will win the match.2.That he has made a very imortant discovery in cheistry is true.It is true that he has made a very important discovery in chemistry.3. That they will hold a meeting is very likely.It is ver
4、y likely that they will hold a meeting.4.That he should do that is strange.It is strange that he should do that.5.That we all should attend the meeting is important. It is important that we all should atend the meeting.6. That the man should have stuck to his silly ideas is strange.It is strange tha
5、t the man should have stuck to his silly ideas.7. That we wont be able to go the south to spend our summer vacation is a pity.It is a pity that we wont be able to go to the south to spend our summer vacation.8.What caused the accident is still a mystery.It is still a mystery what caused the accident
6、.9.That he has gone to Shanghai is said.It is said that he has gone to Shanghai.10.That the gun powder was first invented by the Chinese is known to all.It is known to all that the gun powder was first invented by the Chinese.11.That the work should be done with great care is suggested.It is suggest
7、ed that the work should be done with great care.小结：1.It is +形容词 /名词/某些动词 ed+that 从句2.有些 that 从句中用虚拟语气（4,5,6,11）一主语从句 键入文字 2主语从句:两种类型的主语从句：一种是 it 做形式主语，第二种是常规主语从句2. 用 it 作形式主语的结构 (1) It is 名词从句 It is a fact that 事实是 It is an honor that 非常荣幸 It is common knowledge that 是常识 (2) it is 形容词从句 It is natura
8、l that 很自然 It is strange that 奇怪的是 注意：这种句型要虚拟：It is necessary that the problem should be settled at once.这个问题必须马上解决。It is strange that he should have gone away without telling us.他竟然没有向我们说一声就走了，真是奇怪。(3) it 不及物动词从句 It seems that 似乎 It happened that 碰巧 (4) it is过去分词从句 It is reported that 据报道 It has be
9、en proved that 已证实 第二种：（1）That he finished writing the composition 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 hasnt been decided yet. （4） Whom we must study for is a question of great importance. （5）What caused the
10、accident remains unknown. （6）Whatever you did is right.常规主语从句，即句子在复合句中充当一个主语 注意：主语从句的时态：不受主句的时态影响和限制。这两种主语从句的不同之处在于，第一种 that 不做任何成分，第二种 what 等连接词在从句中作成分。如上述例子考点：引导词 if 和 whetherif 和 whether 引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句 (放在句首时)、表语从句常由whether 引导.例如:Whether she will go home or not is unknown.她是否回家还不
11、得而知 . Whether we shall raise ducks or geese remains to be decided.我们是养鸭还是养鹅仍没决定.=It remains to be decided whether/if we shall raise ducks or geese.但我们不能说 If we shall raise ducks or geese remains to be decided.巩固练习1. _ well go camping tomorrow depends on the weather. A. If B. Whether C. That D. Where
12、 B巩固练习1. -Do you remember _ he came? -Yes, I do. He came by car.键入文字 3A. how B. when C. that D. if A2. It was a matter of _ would take the position. A. who B. whose C. whom D. whomever A3. -I drove to Zhuhai for the air show last week.-Is that _ you had a few days off?A. why B. when C. what D. where
13、 A4. I read about it in some book or other, does it matter _ it was? A. where B. what C. how D. which DEg： What is done cant be undone.已成定局，无可挽回What we cant get seems better than what we have. 我们得不到的东四似乎比已经得到的要好。That we should work out a plan to deal with the present serious situation is important.我
14、们应该制定一项计划来应付目前严峻的形式，这一定啊非常重要That a new teacher will come to teach us geography is true. 一位新老师将来教我们地理，这是真的。主语从句和强调句的比较：It 作形式主语和 it 引导强调句的比较 例如：It is a pity that you didnt go to see the film. 主语从句It is him whom I met at the school gate. 强调句比较：It is surprising that Mary should have won first place.令人惊奇的是玛莉竟然获得了第一名.It is Mary that has won first place.正是玛莉得了第一名.第一句话中的 It 是形式主语,that 引导的是主语从句.句中的 It is 和 that 无法删除,一旦删除句子就不成立.
