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1、GrammarGrammarGrammar 主语从句：做主语用的名词性从句，因其在复合句中做主语， 又称主语从句，引导主语从句的有连词that ， whether， 连接代词who ，what ，which， 连接 副词when，where， how， why等。1）从属连词：that， whether等. that 引导主语从句只起引导作用，本身无实 际意义，在主语从句中不充当任何成分，但 不能省略。That he will win is certain.他肯定会赢。 Whether hell come here isnt clear. 他 是否会来这里还不清楚。 注意: 由that 引导的
2、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: 1. That he will refuse this piece of advice is impossible. _ _2.That they should like each other is natural._*it为形式主语It is natural that they should like each other.It is impossible that he will refuse this piece of advice.这样就构成了下面一些常用句型: 1) It i
3、s + 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*_(很遗憾)we lost the match.*_(这是事实)he cheated in the exam.It is a pity thatIt is a fact that2) It is + adj. +从句 Its certain that 肯定 It is possible that. 很可能 It is unlikely that. 不可能
4、 It is obvious that 很明显It is necessary important natural. that*_(很可能)she will come back tomorrow. *_(很明显)this measure is effective.+(should) +doIt is possible thatIt is obvious that3) It +不及物动词+从句 It happened that. 碰巧 It occurred to me that我突然想起*_(刚好)I came into the office at that time.*_(我突然想起)I fo
5、rget to sent the letter.It happened thatIt occurred to me that4) 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
6、 out that需指出的是 *_(据报道)20 people were killed in the accident. *_(建议)we should eat more vegetable and do more exercise.It is reported thatIt is suggested that2.连接代词who ，what ，which, whatever, whichever, whoever (Who, whom, which, what可 以和ever构成合成词，和what一样引导从句，ever起到 强调作用。此类主语从句不能用形式主语it引导，它们在 句子中担任成分，
7、不能省略，语序为陈述语序)What many scientists believe is that the earth is round Who will take part in the meeting has not been decided.Whoever breaks the law will be punished.Which student will win is uncertain. Whatever was said here must be kept secret. 这里说的话都应当保密。Whoever makes mistakes must correct them. 凡犯
8、了错误的人都必须改正。3)连接副词when，where， how， why等。Why they suddenly disappeared still remains a mystery.When they will leave is not decided.Where she is from is unknown.How we will paint the house has not been decided.注意: 1）主语从句在句首时，必须由连接词引 导，不能省略这些连接词；但是如果用it 做形式主语，而把主语从句放在句末时， 从属连词that可以省略。误：They should like
9、 each other is natural. 正：That they should like each other is natural. 正：It is natural (that) they should likeeach other.2)如果主语从句放在句首，不能用if引 导，但是如果用it 做形式主语，而把主 语从句放在句末时，也可以用if引导. 或把if 改为whether 误：If Mary really heard him is really doubtful. 正：It was doubtful if Mary really heard him. 正: Whether Mar
10、y really heard him is really doubtful. Complete the sentences using what, whether, where, when， who, why, how or that.1.(_ is needed for success) is your hard work.3.(_ we will go tomorrow )hasnt been decided yet.2.(_ they will arrive )has been told to the teacher.4.(_ can join in the sport meet) is
11、 decided by the teacher.5.(_ it will rain or not) is not clear.WhatWhen/HowWhere/whetherWhoWhether主语从句作主语时，谓语动词一般用单数形式。Conclusion:主语从句的规律：找出下列句子中的错误，并总结规律例1.When will he come is not known.规律一、主语从句一律用陈述语序，即主语在前，谓语在后。正：When he will come is not known.主语从句的规律：例2. He will not come to the meetingthis even
12、ing is true. 正：That he will not come to themeeting this evening is true.规律二、连词that 在从句中无实际意义，但不能省略。主语从句的规律：例3. If the meeting will be put off has not been decided yet.正： Whether the meeting will be put offhas not been decided yet.规律三、whether 可以引导主语从句，放在句首，但if不能主语从句的规律 ： 例4. That whether he will help
13、 othersis a fact.正：That he will help others is a fact.规律四、主语从句中的连词不能重叠使用。主语从句的规律 ：例5. When he will come are a puzzle. 正：When he will come is a puzzle.规律五、含主语从句的主句谓语动词多用单数第三人称形式。主语从句的规律 ：1. What he needs is that book.2. What he needs are some books.规律六、what 引导的主语从句，可根据表语决定主句动词的单复数形式。规律七、主语从句为了避免头重脚轻现
14、象，用 it 做形式主语，而把从 句放在后面。That the earth turns around the sun is known to all.It is known to all that the earth turns around the sun.找出错误，并给出理由： 1.Where shall we spend the holiday isnt decided. 2.You have made a mistake is a fact.3. If the policeman will come is not certain.4. That is certain that we c
15、an win.we shallWhetherItThat you have5. It is ordered we should leave at once. 6. Where he comes from are a mystery. 7. What whether he likes the job is not clear. 8. Who he is and where he is from is important. 9.What he saw is the stars in the sky.thatisxareareExercises : Part One: 主语从句单选题1. has helped to save the drowning girl is worth praising. A.Who B.The one C.Any
