2021版外研版选修三英语Unit 2 A life’s work 语法大冲关 ppt课件.ppt

1、Unit 2 A lifes work 突破突破 语法大冲关语法大冲关 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

2、、as if/though，because，why 引导的表语从句 观察例句 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。 2as 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

3、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 The reason why I was sad was _ he didnt understand me. What cost him his life was _ he was too careless. All shes worried about is _ he is all right. From space，the earth looks blue.This is _ about seventy one percent of its surf

4、ace is covered by water. that that whether because 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， w

5、hose， 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 Grandma pointed to the hospital and said， “Thats _ I was born.” They never get angry and are always kind to the students.Thats _ the children can always get on well with their robot t

6、eachers. What puzzles me is _ you could tell he was a thief when you first saw him. What worries us most is _ let out of the secret. where why how who .单句语法填空 1The trouble is _ I cant find my way. 2Without his support，we wouldnt be _ we are now. 3This is _ my father has taught meto always face diffi

7、culties and hope for the best. 4By boat is the only way to get here，which is _ we arrived. 5He got caught in the heavy traffic.That was _ he was late. that where what how why 6Energy is _ makes things work. 7We didnt set out; it was _ we wanted to wait until our mother came back. 8The most pleasant

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