2021版外研版选修三英语Unit 2 突破 语法大冲关 （教材讲解）（含答案）.doc

1、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 1The trouble is that I have lost his address. 2What 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

2、例句 1It sounds as if/though someone is knocking at the door. 2Thats because he didn t understand me. 3Thats why he got angry with me. 归纳用法 1as 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。 3Thats because.强调原因；Thats 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

3、时要用 that 引导， 不宜用 because。 即学即练 1 单句语法填空 The reason why I was sad was that he didnt understand me. What cost him his life was that he was too careless. All shes worried about is whether he is all right. From space， the earth looks blue.This is because about seventyone percent of its surface is covere

4、d by water. 三、连接代词和连接副词引导的表语从句 观察例句 1The problem is who we can get to replace her. 2Be sure to be with a strong awareness that you are what you eat! 3The question is how he did it. 4Their difficulty is where they can raise enough money. 归纳用法 1 连接代词 who， whom， whose， what， which， whoever， whatever， w

5、hichever 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 Grandma pointed to the hospital and said， “Thats where I was born.” They never get angry and are always kind to the students.Thats why the children can always get on well with their robot teachers. What puzzles me is how y

6、ou could tell he was a thief when you first saw him. What worries us most is who let out of the secret. .单句语法填空 1The trouble is that I cant find my way. 2Without his support，we wouldnt be where we are now. 3 This is what my father has taught meto always face difficulties and hope for the best. 4By b

7、oat is the only way to get here，which is how we arrived. 5He got caught in the heavy traffic.That was why he was late. 6Energy is what makes things work. 7We didnt set out; it was because we wanted to wait until our mother came back. 8The most pleasant thing of the rainy season is that one can be en

8、tirely free from dust. .完成句子 1It looks as if/though he were drunk. 看起来他好像喝醉了。 2The question is who is to blame for this accident 问题是谁对这起事故负有责任。 3My belief is that I will succeed by working hard. 我相信通过努力我会成功的。 4Jane is no longer what she was ten years ago. 简再也不是十年前的那个样子了。 5The fact is that our team has won the game 事实就是我们队已经赢得了比赛。