1、Subject Clause,主语从句,Subject Clause,内容,主语从句三要素,主语从句定义,Subject Clause,内容,主语从句三要素,主语从句定义,Subject Clause,Find out the Subject in the following sentences:,1. A tree has fallen across the road.,2. She is from China.,3. To find your way can be a problem.,4. Smoking is bad for you.,5. What she said is not t
2、rue.,6.Whenever you finish the task is certainly all right.,名词,代词,不定式,动名词,句子,句子,Subject Clause,Conclusion: A clause (subordinate clause) which serves as subject of a sentence can be called Subject Clause.,观察以下句子，注意主语从句的特点：,That the earth travels round the sun is a well-known fact.Whether the artist
3、can do it or not is uncertain.Why he did it remains a mystery.Whoever breaks the law will be punished.,Subject Clause,内容,主语从句三要素,主语从句定义,Subject Clause,Subject Clause,主语从句的引导词,从属连词：that, whether连接代词：who(ever), which(ever), what(ever)连接副词：where(ever), when(ever), why, how,Subject Clause,主语从句引导词的选择主要是根
4、据从句的结构和意义来选择：,1.连接词：that; whether,如果从句的意义和结构完整，则选用that或whether。-that 本身没有意义，不作句子成分，只表示从句的开始，位于句首时，that不能省略.-whether表示 “是否”，不作句子成分,位于句首。,1） _people cut down too many tress destroyed the balance of nature._we will go camping tomorrow depends on the weather._the solid shape would last or not is not cle
5、ar._you will win the medal seems unlikely.,That,Whether,Whether,That,2. 连接代词： who, which, what（什么，所的）,whose,whom Whoever / whichever / whatever在主语从句中不含有疑问意义。如果从句的意义和结构不完整，根据从句的意义和结构选择相应的连接代词。 连接代词在从句中起名词性作用，担当一定成分（主语、宾语、表语等）。,Subject Clause,1._will take part in the meeting has not been decided.2. _s
6、tudent will win first is uncertain.3. _I cant understand is why he has changed his mind.4. _fails to see this will make a mistake.5. _ was said here must be kept secret.,Who,Which,What,Whoever,Whatever,3. 连接副词：where(ever), when(ever), why, how连接副词when, where, why, how在从句中作(时间、地点、原因、方式)状语。1）_ we shou
7、ld leave it is a problem.2）_he will be back depends on the weather.3)_this happened is not clear to anyone.4) _these Greek statues are in a British museum is an important part of our story today.,Subject Clause,Where,When,How,Why,总结,做题突破方法 三部曲一、首先分清主句和从句二、分析从句缺何种成分三、根据分析，选择恰当的连接词,Subject Clause,eg._
8、they would support us was a problem,Whether,内容,主语从句定义,Subject Clause,主语从句三要素,主语从句的考查难点,主语从句的考查难点,主语从句有时为了使句子结构平衡，避免句子“”头重脚轻“”，常用it作形式主语代替主语从句，放于句首，而把真正的主语（即主语从句）置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下：（1）It + be + 名词 + that从句 名词有（no wander, an honor, a pity, a fact, a shame, good news, a surprise, etc ） 1. _(
9、遗憾的是)that we lost the game.2. _(惊奇的是)that he cheated in the exam.3. _(事实是)that English is being accepted as an international language.4. _(不足为奇的是) that computers are taking over the world.,It is no wonder,It is a pity,It is a surprise,It is a fact,Subject Clause,（2）It + be + 形容词 + that从句 形容词有（obviou
10、s, true, natural, good, wonderful, funny, no surprising, possible, certain, likely, fortunate, doubtful, etc） 1. _ (有必要) that an efficient worker ( should) accomplish his work on time2. _(重要的是)that you (should) think before you say or do anything3. _ (很明显)that this measure is effective.,Subject Clause,It is obvious,It is necessary,It is imporatant that,常含有一个表示“有必要的”之类的形容词。在这种结构中，从句应当“ +that+主语+(should)+动词原形”形式（should常予以省略，而直接接动词原形）。 常见的此类形容词有“important/imperative/necessary/essential有必要的、urgent迫切需要的、desirable合意的等,
