动词的非谓语形式有三种：
（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 writeTo be written
进行To be writing
完成To have writtenTo have been written
完成进行To have been writing
现在分词和动名词一般WritingBeing written
完成Having writtenHaving been written
一般written
发表于 2017-8-6 14:03:34