疑问词引导的名词性从句及it用法.ppt

说 明 名词性从句及it的用法是高中阶段比较重要的语法知识，其用法也比较复杂，就一节课的讲授是不够的。本节课主要根据牛津教材的编排体系进行课本知识的梳理和适当补充，以帮助同学们更好地了解和掌握名词性从句的相关用法。 本节课流程 Revision →Explanations →Exercises Step 1 Revision Go over what we have learnt about Noun clauses in Unit 1 Revision Unit 1中所学内容 a、名词性从句的概念、类型及其用法 b、名词性从句中what、that、if和whether等连词的用法 在复合句中起名词作用的从句叫做名词性从句。 名词性从句 主语从句 表语从句 宾语从句 同位语从句 在复合句中起名词作用的从句叫名词性从句(Noun Clauses)。名词性从句的功能相当于名词或名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。 1.When we will start is not clear. 2.Mrs Black won’t believe that her son has become a thief. 3. My idea is that we should do it right now. 4.I had no idea that you were her friend. 主语从句 宾语从句 表语从句 同位语从句 名词性从句中what、that、if、whether等连接词的用法 (1) that 和what 的用法 that 和 what 都可引导所有的名词性从句。但是，what除起连接作用外，还在名词性从句中充当成分，可作从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。 that / what 1. ______ he wants is a book. 2. ______ he wants to go there is obvious.3. The result is ______ we won the game.4. This is _____ we want to know.5. Is _____ he told us true?6. We should pay attention to ______ the 　teacher is saying.7. I have no doubt _____ he will come.8. I have no idea ____ he did that afternoon. What That that what what what that what 2. if/whether 引导 如果宾语从句为一般疑问句时,用if或whether来引导 e.g. I wonder if/whether he will come on time. ★ if 和whether 的选用 1)从句是一般疑问句作动词的宾语,二者都可用; 2)Whether …or not搭配,不能用if; 3)主语从句不能用if; 4)表语从句与同位语从句也不能用if; 5)修饰介词的宾语从句也不能用if; 6)连词后直接加不定式to do, 连词不能选用if. if / whether1. I asked her __________ she had a bike.2.________ we will hold a party in the open air  tomorrow depends on the weather.3. We’re worried about ________ he is safe.4. I don’t know ________ or not he is well.5. The question is _________ he should do it.6.The doctor can hardly answer the question ________ the old man will recover soon.7. I don’t know _________ to go. if / whether Whether whether whethe