E. 同位语从句

1. The fact that the prisoner was guilty was plain to everyone. 这个被告有罪这一事实是人人都清楚的。

2. The cause why a man suffers from cancer is not yet known. 人患癌症的原因还未弄清楚。

关于名词从句还应指出下列两点：

一、wh-从句充当名词从句时实际上存在着两种情况:疑问词型的名词从句(a)和关系词型的名词从句(b)。请对比：

1. [a) What she wrote was a mystery. 她写了什么还是一个谜。

2. { (b) What we'll do is leave a note for Mum … 我们要做的事情是给妈妈留个字条……

3. [a) I can't understand what you did that for. 我不明白你为了什么做那件事。

4. $\$left\{(\mathrm{b})\mathrm{Ican'tdowhatyouaskedofus.}\right. 我不能干你要求我们做的事。

5. $\$int (a) I'd like to know when they'll let him out. 我想知道什么时候他们将让他出去。

6. { (b) April is when the lilacs bloom. 四月是丁香花开的月份。

7. $\$int (\mathrm{a}) The first thing is to find out where she is. 第一件事是弄清她在哪儿。

8. $\$left\{(\mathrm{b}) \text {Where she went was Manchester.} \right. 她去的地方是曼彻斯特。

二、wh-从句前的介词常常是可以省略的，见prepositions $^{1}$ ，note $^{4}$ ，idea $^{2}$ 。