名词性从句可以称作为主语从句，主语从句就是用来做句子的主语的。主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。

一、由that引导的主语从句。
1. That he is still alive is a wonder.
他还活着，真是奇迹。
2.That we shall be late is certain.
我们要晚了，这是确定无疑的。
3.That he should have ignored the working class was natural.
他忽视工人阶级是很自然的。
4. That she is still alive is a consolation.
她还活着是使人感到宽慰的。
5. That she became an artist may have been due to her father’s influence.
她成为画家可能是受她父亲的影响。
6. That you are coming to London is the best news I have heard this long time.
你将来伦敦是好久以来我听到的最好消息。
7. That she was chosen made a tremendous stir in her village.
她被挑选上，在她村 子里引起很大轰动。

二、关系代词型what引导的主语从句。
1. What we need is money.
我们需要的是钱。
2.What I want to know is this.
我想知道的就是这一点。
3.What’s done is done.
事已成定局。
4.What he says is not important.
他说的话并不重要。
5.What I am telling you is mere impressions.
我和你说的都不过是一些印象而已。
6. What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。
7. What you need is a good-sized canvas bag.
你需要的是一个比较大的帆布袋。
8.What I am afraid of is their taking him to Portugal.
我担心的是他们把他带到葡萄牙去。