名师点拨：英语四级考试谓语动词语法精解

　　非谓语动词中分词的体有完成体和进行体，即having done, having been done和being done，完成体只用于做状语的场合，而进行体可以用于做定语和做补足语。

　　动名词的体也有having done, having been done和 being done的结构主要用于做主语和宾语的场合。

　　不定式的体有to be doing 和to have done，主要用于pretend, happen, seem, appear, be said to等结构中。如：

　　① The man in the corner confessed to _____ a lie to the manager

　　of the company.(1997.6)

　　A. have told B. be told C. being told D. having told

　　having told在句中做介词宾语，表示动作发生在谓语动词之前。

　　② I'd rather read than watch television; the programs seem ____

　　all the time.(1997.1)

　　A. to get worse B. to be getting worse

　　C. to have got worse D. getting worse

　　从all the time的使用可以推断get worse是一个渐变过程，所以用不定式的进行体。

　　③ The speech _____ a lively discussion started.(1995.1)

　　A. being delivered B. was delivered

　　C. be delivered D. having been delivered

　　该结构属于独立主格结构做时间状语，状语分词所表示的动作发生在谓语动词之前，所以应该用完成体，答案为D。