6.名词化的介词作主语。如：The ups and downs of life must be taken as they come.
我们必须承受人生之沉浮。
7.不定式用作主语。 如：To find your way can be a problem.你能否找到路可能是一个问题。
It would be nice to see him again.
如能见到他，那将是一件愉快的事。
8. 动名词用作主语。如：Smoking is bad for you. 吸烟对你有害。
Watching a film is pleasure, making one is hard work.
看电影是乐事， 制作影片则是苦事。
9. 名词化的过去分词用作主语。如：The disabled are to receive more money.
残疾人将得到更多的救济金。
The deceased died of old age.
死者死于年老。
10. 介词短语用作主语。如：To Beijing is not very far. 到北京不很远。From Yenan to Nanniwan was a three-hour ride on horseback.
从延安到南泥湾要三个小时。
11.从句用作主语。如: Whenever you are ready will be fine.
你无论什么时候准备好都行。
Because Sally wants to leave doesn’t mean that we have to.
不能说萨利要走因而我们也得走。
12.句子用作主语。如：”How do you do ?” is a greeting.“你好”是一句问候语。