非谓语动词的类型:Infinitive 不定式（to do)Gerund 动名词(doing)Participle 分词(-ing分词，-ed分词）Structure : to be doneInfinitive（不定式）:to doNegative (否定): not to doPassive voice（被动）:被动语态一般式进行式完成式完成进行式Tense and Voice （时态与语态） to be doing to have done to have been done - to have been doing-to doto be done主动语态1. 作主语2. 作表语3. 作宾语4. 作补语5. 作定语6. 作状语在句中承担的成分:7. 作独立成分8. 与疑问词等连用(1). 主语 Subject不定式作主语时,往往放在谓语之后,用it作形式主语.To get enough sleep at night is important.It_.It is adj. (for sb) to do sth.It is+a pleasure/an honor/a pity to
