动词不定式短语作表语主要有以下句型：
1、动词不定式短语直接作表语
动词不定式短语作表语相当于名词作表语，它和主语处在同等地位。它所指的或是和主语一样的东西，或是主语所产生的结果。常常可以将主、表交换位置，句子的意义不变
The greatest test of courage on earth is to bear defeat without losing heart. 世间勇气的最大考验是容忍失败，决不丧志。
The masterpiece of man is to live to the purpose. 人之杰作是生活有道。
To ask well is to know much. 善问懂得多。
动词不定式作表语一般带to，但如果主语部分有实义动词do，可以带to，也可以省略to
What he wanted to do was (to) wash his hands of it. 他打算不再参与此事。
The only thing you can do is (to) wait and see. 唯一你能做的是等着瞧。
2、“how/what/ when/where/which/why 不定式短语”结构作表语
The question is how to improve ourselves in English. 问题是如何提高我们自身的英语。
The problem is where to find the answer. 问题是到哪里去找答案。
The point is what to do and why to do it. 问题是做什么，为什么做。
3、“for there to be n.”结构作表语
What John was waiting for was for there to be complete silence. 约翰等待着要大家完全安静下来。
