如果逻辑主语 名词(代词) 与 分词是主动关系 就用现在分词 即 名词(代词)+现在分词
he doing his homework,his mother was cooking
如果逻辑主语 名词(代词) 与 分词是被动关系 就用过去分词 即 名词(代词)+过去分词
如 his homework done ,he watched tv.
如果逻辑主语 名词(代词) 与 分词是主动关系 就用现在分词 即 名词(代词)+现在分词
he doing his homework,his mother was cooking
如果逻辑主语 名词(代词) 与 分词是被动关系 就用过去分词 即 名词(代词)+过去分词
如 his homework done ,he watched tv.