Because he dod not know how to do it,he turned to her for help(用现在分词改写状语从句）
问题描述：
Because he dod not know how to do it,he turned to her for help(用现在分词改写状语从句）
答
Not knowing how to do it, he turned to her for help.knowing在这里表示主动。因为动作是“他”做的，所以用knowing。。既表主动。又表示原因。谢谢。
答
Not knowing how to do it,he turned to her for help.