可以改写为独立主格的的应该是状语从句.而with结构一般都是很难用从句来表示的.
After class was over （=Class being over / Class over）,the students soon left the classroom.
Miss Smith entered the classroom,with a book in her hand.(=and she holds a book in her hand.)
什么样的句子可以改写成独立主格或with 复合句