一.结构 : to do (否定) not to do 二. 时态与语态 主动语态 被动语态 一般式 进行式 完成式 完成进行式 不定式 to do to be done to be doing to have done to have been done to have been doing - -1. 作主语 2. 作宾语 3. 作宾语补足语 4. 作定语 5. 作状语 6. 作表语 7. 作独立成分 8. 与疑问词等连用三. 用法/ 功能 To see is to believe. Its important to learn . (1). 主语 不定式作主语时,往往放在谓语之后, 用it作形式主语. My job to help the patient. Your task to clean the classroom. is is (2). 表语I want to go home. The workers demanded to get better pay. I found it necessary to talk to him again. (3) 宾语 think/ c
