考研英语完型、阅读、翻译及写作都不开语法知识，语法是基础，考生一定要熟悉，且灵活的掌握。2017考研复习之初，新东方在线给大家讲解语法知识点，希望考生能够从现在日积月累，最终质变提升。下面讲解的是关于动词的三种非谓语形式的知识点，大家请看：
2017考研英语语法小讲：动词的三种非谓语形式
(1)动词不定式：to study (to + 动词原形)
(2)分词：studying (现在分词)、studied (过去分词)
(3)动名词：studying (形式与现在分词相同)
动词非谓语形式仍具有动词的一般特征，可以带有宾语、状语等构成短语。
动词非谓语形式有以下几种形式变化(以write为例)：
| 形态 | 主动 | 被动 | |
| 动词不定式 | 一般 | To write | To be written |
| 进行 | To be writing | ||
| 完成 | To have written | To have been written | |
| 完成进行 | To have been writing | ||
| 现在分词和动名词 | 一般 | Writing | Being written |
| 完成 | Having written | Having been written | |
| 一般 | written |