1、 Section Learning About Language 语法专题练习语法专题练习 单元语法精析单元语法精析 夯基提能作业夯基提能作业 单元语法精析单元语法精析 主语从句 语法精讲 主语从句是名词性从句的一种，在复合句中作主语，相当于名词。 主语从句的位置可以在句首，也可以用it作形式主语，主语从句放在后 面。 一、主语从句的引导词 引导词用法 从属 连词 that，whether，if 在从句中不作成分，that没 有实际意义，whether和if意 为“是否” 连接 代词 who(ever)，whom(ever)，whose， what(ever)，which(ever)等 在从句
2、中作主语、宾语、表 语、定语等 连接 副词 when，where，why，how等 在从句中作状语，表示时间、 地点、原因、方式等 1.连词that和whether在从句中不作任何句子成分，只起连接从句的作 用。 It is often the case that anything is possible for those who hang on to hope. 通常情况下，对于那些心存希望的人，一切皆有可能。 Whether she will come or not is still a question. 她来不来仍是个问题。 How this happened is not clea
3、r to anyone. 这事怎样发生的，谁也不清楚。 Whoever comes is welcome. 不论谁来都欢迎。 Wherever you are is my homemy only home. 你所在的任何地方都是我的家我唯一的家。 用适当的连接词填空 _ will happen to the world is difficult to predict. _ we will go camping tomorrow depends on the weather. _ will take the place of our original headmaster hasnt been
4、decided yet. _ he gave up the chance of studying abroad is unknown. _ we will have the picnic next week is being discussed. What Whether Who Why Where 二、常用形式主语it的结构 若主语从句较长，而主句谓语部分又相对较短时，常用it作形式主 语，同时将主语从句后置。 1It is a fact (a good idea/a pity/a shame/no wonder.)that从句。 It is a pity that you missed t
5、he film. 你没有看那部电影真是太遗憾了。 2It is necessary (clear/true/strange/important/wonderful.)that从 句。从句多用虚拟语气，即从句谓语用“(should)动词原形”。 It is necessary that you (should) master English. 你有必要掌握英语。 3It is reported(well-known/hoped/thought/expected/said/believed/ decided/suggested/ ordered.)that从句。 It is said that h
6、e was killed in the earthquake. 据说他在地震中丧生了。 4It seems (happens/appears/doesnt matter/makes no difference.) that从句。 It seems that they will win the game. 看起来他们将会赢得这场比赛。 句型转换 That he should know about it is important. _ he should know about it. That he has gone to Shanghai is said. _ he has gone to Sh
7、anghai. It is important that It is said that 三、whatever和whoever whatever和whoever可以引导主语从句，并在从句中作主语、宾语、 表语等。此外，它们还可以引导让步状语从句。 Keep calm, whatever happens. 不管发生什么事都要保持镇静。 Your support is important to our work.Whatever you can do helps. 你的支持对我们的工作很重要。你能做的任何事都会有所帮助。 判断下列从句的类型 Whoever breaks the law shoul
8、d be punished._ Whoever breaks the law, he should be punished._ Whatever may happen, you must keep calm._ 主语从句 让步状语从句 让步状语从句 四、主语从句中的虚拟语气 在主语从句中如果主语太长，宾语或表语又太短，为了避免头重脚 轻，保持句子平衡，通常会采用it作形式主语，真正的主语从句放在后 面。 常见的使用it作形式主语的结构： 1在“Itbe形容词that从句”句型中，如果形容词为 necessary，important，strange，natural等时，从句谓语动词常用 “(sh
9、ould)动词原形”。 It is necessary and important that one (should) master the skill of operating computers so as to meet the need of a job. 为了满足工作上的需要，掌握电脑操作技巧是很有必要并且是很重 要的。 2在“Itbe过去分词that从句”句型中，如果过去分词为 suggested，advised，ordered，requested，required等时，that从句谓语动 词使用“(should)动词原形”。 It is suggested that the sp
10、orts meeting (should) be put off. 有人建议推迟举行运动会。 单句语法填空 It is suggested that the work _ (do) in a day. It is strange that he _ (treat) the man in a friendly way. (should) be done (should) treat 五、主语从句的语序时态问题 主语从句和其他名词性从句一样必须使用陈述语序，尤其是当主语 从句是疑问词引导的时候，主语从句的语序仍须使用陈述语序。 Who/Whom he will go to Beijing with
11、 remains unknown. 他将和谁一起去北京还不知道。 1主语从句的时态根据具体语境来确定，尤其是当when引导主语 从句的时候，有些同学会和when时间状语从句混淆而误用现在时表将 来。 When he will come back is still unclear. 他什么时候回来还不清楚。 单句语法填空 _ is impressive is that my colleagues messaged us, worrying why Kun and I didnt come back with the clock pointing to 1 am, 2 am or even 3 a
12、m. _ worries many people is that these chemicals may even cause cancer. _ comes first will get the first prize. What What Whoever 2主语从句作主语相当于名词，和非谓语动词的动词-ing形式或者 不定式作主语一样看作单数，句子谓语应该使用单数形式。 That you dont like him is none of my business. 你不喜欢他不关我的事。 What the doctors really doubt is whether my mother will recover from the serious disease soon. 医生怀疑的是我的妈妈是否不久就能从这场重病中恢复过来。 remains is seems was
