1.名词作主语
Pride goes before a fall.骄必败。
Little streams feed big rivers.小河流入大江。
2.代词作主语
He told a joke but it fell flat.他说了个笑话，但没有引人发笑。
All of the students are interested in it.所有的学生对此都很感兴趣。
3.数词作主语
Twenty years is a short time in history.二十年在历史上只是很短的一段时间。
Two-thirds of the students are boys in our school.我们学校三分之二的学生是男生。
4.名词化形容词作主语
The poor get poorer；the rich get richer.穷者愈穷；富者愈富。
The idle are forced to work.懒汉被迫劳动。
5.不定式作主语
To hesitate means failure.犹豫不决就意味着失败。
For him to admit his mistakes is not easy.要他承认错误是不容易的。
6.动名词作主语
Watching a film is his hobby.看电影是他的爱好。
Swimming in this river is a great pleasure.在这条河里游泳是非常快乐的事。
7.从句作主语
What we shall do next is not yet decided.下一步做什么还没有决定。
Whether they would support us was a problem.他们是否会支持我们还是一个问题。