The teacher came in the classroom with handing a book in his hand.分词作为伴随状语从句
问题描述：
The teacher came in the classroom with handing a book in his hand.分词作为伴随状语从句
其中,分词前什么时候可以加逗号啊
答
把with去掉后,分词前可加逗号,其实不加逗号也行的