高中英语 Unit 2 A life’s work突破 语法大冲关学案（含解析）外研版选择性必修第三册-外研版高二选择性必修第三册英语学案

Unit 2 A life’s work表语从句在复合句中，位于系动词之后作表语的从句称为表语从句。一、that，whether 引导的表语从句[观察例句]1．The trouble is that I have lost his address.2 ． What he wants to know is whether we can finish our work by tomorrow morning.[归纳用法]1．连接词 that 在从句中只起到连接作用，不作任何成分。2．连接词 whether 起连接作用，意为“是否；究竟；到底”，在句中不作任何成分。二、as if/though，because，why 引导的表语从句[观察例句]1．It sounds as if/though someone is knocking at the door.2．That's because he didn't understand me.3．That's why he got angry with me.[归纳用法]1．as if 引导表语从句时，可以和 as though 互换。2．as if/though 引导的表语从句常置于系动词 look，seem，sound，be，become 等后面。3．That's because...强调原因；That's why...强调结果。[名师点津]reason 作主语时，后面的表语从句表示原因时要用 that 引导，不宜用 because。[即学即练 1] 单句语法填空①The reason why I was sad was that he didn't understand me.②What cost him his life was that he was too careless.③All she's worried about is whether he is all right.④From space，the earth looks blue.This is because about seventyone percent of its surface is covered by water.三、连接代词和连接副词引导的表语从句[观察例句]1．The problem is who we can get to replace her.2．Be sure to be with a strong awareness that you are what you eat!3．The question is how he did it.4．Their difficulty is where they can raise enough money.[归纳用法]1．连接代词 who，whom，whose，what，which，whoever，whatever，whichever 在表语从句中充当主语、宾语或定语。2．连接副词 where，when，how，why 在表语从句中充当状语。[即学即练 2] 单句语法填空①Grandma pointed to the hospital and said，“That's where I was born.”②They never get angry and are always kind to the students.That's why the children can always get on well with their robot teac...