「语法篇」名词性从句中的八大易错点
名词性从句相当于名词，按其在句子中的作用可分为以下4种：
1.主语从句
2.宾语从句
3.表语从句
4.同位语从句
名词性从句中的连接词：
名词性从句中的八大易错点：
一、if和whether的区别:
eg: I don't care wether or not he comes.
二、if/wether和that的区别:
eg: _______ you are accepted by Tsinghua University is good news.
We offer her the job, but I don't know _______ she'll accept it.
三、that和what的区别:
that在句子中只起连接作用，不充当任何成分，引导宾语从句时可省略。
what 除了连接句子成分之外，在句子中还可以充当主语、宾语。
eg: Experts believe _________ people can waste less food by shopping only when it is necessary.
It is bu no means clear ______ the president can do to end the the strike.
四、it作形式主语、形式宾语：
It 作形式主语：
eg: It is certain that you will pass the College Entrance Exam.
It is a pity that I missed the party held last night.
It is reported that the accident was caused by carelessness.
It had never occured to him that he might be falling in with her.
It 作形式宾语（常见的谓语动词：make, think, feel, find, consider等）：
eg: I find it important that we should keep calm in danger.
五、wh-ever引导的名词性从句：
whoever,whichever, whatever, whomever在剧中可作主语，宾语
六、表语从句中的固定句式：
备注：英语中表达“.......的原因是......”时要用“the reason why ...... is that”不能用because
eg: The reason why he was absent was that he was ill.
What comforted the youg mother was that the baby came to life.
It looks as if it is going to rain.
七、it作形式主语引导的主语从句和强调句型的区别：
区别：去掉强调句型中的it/this is/was ...... that/who, 然后把强调部分还原回句中，句子通顺则是强调句型。
判断：It is a rule that he gets up at six o'clock every morning.
It is the little girl that/who I want to see.
reported1.同位语从句和定语从句的区别：
eg: It was in this house ______ he was born.
It was this house ______ he was born.
It was in this house _____ he used to live in that the meeting was hold.