who 引导同位语从句。
例: The problem who should do the work requires consideration. 谁该干这项工作的问题需要考虑。
which 引导同位语从句。
例: Zhang Huiying hasn't solved the problem which university she should choose. 张惠颖还没有解决择校的问题。
what 引导同位语从句。
例: I have no idea what has happened to him. 我不知道他发生了什么事。

背单词的好方法
随时随地背单词
不知不觉背单词

即使单词拼写以辅音字母开头，但该词的读音是元音音素开头，加不定冠词时也要用＂an＂，例如：an hour，an honest boy；反之，拼写以元音字母开头，但读音是辅音，加不定冠词时要用＂a＂，例如：a university。
so…that与such…that:
so…that和such…that都作＂如此……以致＂解，that引导结果状语从句。常见句型如下：

【注意】①that 引导的同位语从句与定语从句的区别：
在同位语从句中：that 不可以省略，不作成分；
定语从句的关系代词that 在定语从句作成分，作宾语时可以省略
例: We are interested in the news that some foreigners would visit our school.
We are interested in the news that he told us.
when, where 引导的同位语从句与定语从句的区别：
在定语从句中，when, where 前有分别表示时间、地点的先行词；而在同位语从句中无此对应关系
例: They have no idea at all where he has gone.(同位语从句)
Go and get your coat. It’s in the place where you left it.(定语从句)

such…that和so…that有时可以换用，条件是such所修饰的名词必须是一个单数可数名词，且该名词还带有表性质的形容词。转变公式如下：such a/an+形容词+名词→so+形容词+a/an+名词。
例如：He is such a good student that we all like him.
→He is so good a student that we all like him。
但是，如果是不可数名词或复数可数名词，则只能用such，不能用so修饰。

The most pleasant thing of the rainy season is _____ one can be entirely free from dust.
A. what           
B. that     
C. whether          
D. why
The manager put forward a suggestion ____ we should have an assistant. There is too much work to do.
A. whether       
B. that          
C. which       
D. what 

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