通常，介词后接名词或代词，但确有如下特殊情况。
一、介词+形容词
- regard space life as common（2012辽宁卷阅读理解B篇第三题选项C）
- The books are listed from easy to difficult.
- Her physical condition went from bad to worse.
- I tried to visit as many neighborhoods as possible. (COCA)
- This is something I never would have considered as important. (COCA)
- Efforts are not seen as enough. （2012四川阅读E篇）
二、介词+非名词性短语
- We will go there by car instead of by train.
