1. I found him finished the homework. (错)
I found that he had finished his homework. (对)
2. I saw him finish the homework (对)
I saw him finished the homework (错)
3. 过去分词作宾补,对是否是及物动词的过去分词没有限制。
如:I found him killed. (kill及物), I saw her gone. (go 不及物)。
过去分词本身就表示完成,作宾补时,done前不再用having.