1． 宾语补足语：能用分词作宾语补足语的动词不多，常见的有see, hear, notice, look at,
　watch, find, smell, feel, catch, keep, set, have, make, leave, start等，如：
　　I heard her singing in the next room.
　　He was surprised to find his room thoroughly cleaned.

　现在分词和不定式都可作宾语补足语，现在分词表示动作正在发生，不定式表示动作已
　经发生了，如：
　　- Do you hear someone knocking at the door?
　　- Yes, I heard him knock three times.

　有时意思差别不大，用分词或不定式都可以，如:
　　She liked to watch the children play(ing) in the courtyard.

2． 主语补足语：分词作主语补足语多用在被动结构中，如：
　　The prisoners were watched working in the field.
　　My hometown was found greatly changed.

3． 介词宾语补足语：主要用在"with＋名词（代词宾格）＋分词"结构中，分词作介词的
　宾语补足语，with介词短语在句中作状语，如：
　　You can't leave the workshop with the machine running.
　　I saw Granny sitting in the chair with her eyes closed.
　　With the test finished, we began to analyze the result.