表语、主语从句.ppt

外研版选修7 Grammar Module 2 Highlights of My Senior Year The prom was very attractive. The boy standing over there is my classmate. My belief is that he’s got a health problem. 表语从句：在句子中作表语，一般放在系动词后面，常用结构是 主语＋系动词 ＋表从。 常见的连系动词有：be, look, remain, become, turn, get, go, seem, feel, smell, taste, … Grammar 1 – 1.Observation Take a look at these sentences. 由从属连词that，whether引导 The question is whether you should ask them for help. 问题是你是否需要向他们求助。 The trouble is that I have never done the work before. 麻烦的是以前我从没做过这个工作。 由连接代词what，who，which引导 Beijing is not what it used to be. 北京不再是过去的北京了。 What she wants to know is which dress she should buy. 她想知道的是应该买哪件衣服。 由连接副词when，where，how，why引导 That is where Lao She used to live. 这就是老舍过去生活的地方。 That is why I didnt pass the exam. 这就是为什么我没通过考试的原因。 表语从句的虚拟语气 在表示建议、劝告、命令含义的名词作主句的主语时，表语从句的谓语动词需用“should＋动词原形”表示，should可省略。常见的词有：advice，suggestion，order，proposal，plan，idea，request，requirement等。 My suggestion is that we (should) start early tomorrow.我的建议是明天早出发。 because，why引导的表语从句 Thats because he didnt understand me.(Thats because...强调原因) Thats why he got angry with me.(Thats why...强调结果) 应注意的问题 ①表语从句还可以由as if，as though引导。 He looks as if he were angry. 他看上去好像很生气。 ②名词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。 The reason why I was sad was that he didnt understand me. 我伤心的原因是他不理解我。 ③连词that引导表语从句时，不能省略，尤其是从句较长或结构较复杂时。 应注意的问题 The problem with looking into space from the earth is that there is lots of dust in the earths air.从地球看太空的问题是空气中有很多灰尘。 ④引导表语从句只能用 whether，不能用if。 The question is if the enemy is marching towards us.(×) The question is whether the enemy is marching towards us.(√) ⑤表语从句一定要用陈述语序 The question is when can he arrive at the hotel.(×) The question is when he can arrive at the hotel.(√) ⑥不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。 The question is who will travel with me to Beijing tomorrow.(√) The question is why he cried yesterday.(√) 事实是他们有着不同的观点。 The fact is ______________________________________. 问题是她明天是否会来。 The question is _____________________