现在分词的完成时态Having finished his homework,the boy went on to help his mother
问题描述：
现在分词的完成时态Having finished his homework,the boy went on to help his mother
Having finished his homework,the boy went on to help his mother.
Not having finished his homework,he was forbidden
to watch the game.
两句中Having finished用法相同吗?having done怎么用?
答
第一句是用作状语开头,当前面没主语时可以这么用,第二句则是倒装句式,用法是一样的,都表示过去的过去,只不过状语才用having.至于怎么用,是表示这个动作完成了但对现在还有影响,这个时候通常用have done,having done是在作状语,宾语时的衍生状态.虽然我知道不太全