人教版2017高考英语全套解析一轮复习课件：语法精要11 名词性从句_高考复习指南

人教版2017高考英语全套解析一轮复习课件：语法精要11 名词性从句

　　(3)reason后面的表语从句用that引导；定语从句用why或that引导。请比较下面两个复合句： The reason why we don't trust him is that he has often lied. 我们不信任他的原因是他经常撒谎。 You must tell him the reason why/that you won't accept his offer. 你必须告诉他你不接受他报价的原因。 (4)由连接副词引导的表语从句。如： That is where the great writer used to live. 那就是大作家以前住的地方。 That is why he didn't pass the exam. 那就是他没通过考试的原因。 That was when I was thirty. 那就是我30岁的时候。 (5)表语从句还可用as，as if/though引导。如： Things were not as they seemed. 事情并不像他们看到的那样。 It looks as if it is going to rain.看上去好像要下雨了。 as if引导表语从句时，谓语动词可用陈述语气，也可用虚拟语气。如： When a man loses consciousness，it looks as if he were dead. 当一个人失去知觉，他看上去像死了。 4．同位语从句 (1)同位语从句常放在fact，news，idea，truth，hope，problem，information，belief，thought，doubt等名词的后面，是对前面的名词作进一步的解释，说明前面的名词的具体的含义。如： The hope that he may recover is not gone yet. 他恢复的希望还没有破灭。

　　The problem whether we should continue to do the experiment has been solved.(if不能代替whether来引导同位语从句) 是否我们应该继续做实验的问题已经解决了。 I have no idea when he will come back. 我不知道他将何时回来。 (2)同位语从句与定语从句的区别：同位语从句是对前面名词的内容作进一步的解释、说明，引导词只起引导作用，不在句中作任何成分，一般不可省略。定语从句是对前面名词进行修饰、限制，引导词在句中作一定的句子成分。如： The news that_they_had_won_the_game soon spread over the whole school. 他们赢得比赛的消息很快就传遍了整个学校。(此句为同位语从句，进一步解释“the news”的内容) The news you told me yesterday was really disappointing. 你昨天告诉我的消息真的很令人失望。(此句是定语从句，它指的是“你昨天告诉我的那个消息”) 5．whether与if在名词性从句中的用法区别 (1)引导主语从句时 whether引导的主语从句可放在句首，也可放在后面，但if引导的主语从句一般放在句尾。如： Whether I'll go there is not decided. 是否我将去那还没决定。 It is not decided whether/if I'll go there. 是否我将去那还没决定。