形式有三种：动词不定式，动名词，分词。动词不定式相当于名词，形容词，副词，可做主语，宾语，宾补，表语，定语，状语（即谓语以外的所有句子成分）；动名词相当于名词，可做主语，宾语，表语，定语；分词相当于形容词，副词，可做宾补，表语，定语，状语； (2)语态：若逻辑主语是动作的发出者，则用主动；若逻辑主语是动作的承受者，则用被动；若逻辑主语既不是动作的发出者也不是承受者，则：动词不定式用独立结构动名词用复合结构分词用独立主格结构举例： A）动词不定式作主语：To finish my homework is my job.宾语：I want to have a wise brain.宾补：I want you to attend the meeting.表语：You job is to earn money.定语：He is to go to college.状语：I get up early in order to recite the poem.独立结构：To tell you the turth,I am a student.注意：1:有些宾语的不定式有自己的补语，则应用it做形式宾语，而将真正的宾语后置，如：I think it important to study English well.2:不定式一般不做介词的宾语，除在极少数介词后才行（如but,except），此时动词不定式可带to也可不带to，如：He seldom comes except (to)see my daughter. B)动名词做主语：Reading is my habbit.宾语：The old need looking after.表语：I am reading.定语：He was looking the hanging picture.复合结构：Alan's illness accounts for his coming late for school.注意：1：一些特殊句式，如It is no good(no use,fun,a wast of time) doing There is no..... doing 2:动名部分知识展示 词复合结构的一般规则是：逻辑主语是有生命的名词，作主语时，须用名词的所有格形式或形容词性物主代词；作宾语时，可用普通格或人称代词宾格。C）：分词作宾补：I mind your somking.表语：The news is encouraging./The glass is broken.定语：This is a reading room./The book written by him is interesting.状语：Seen from the top of the mountain,the city is beautiful.电话13963903995