关于with复合结构

he came into the classroom with some books.

with + 名词
with + 动词ing 表主动
with + 动词过去分词 表被动
with + to do 表将来

With some book in his hand,he entered the room.
with是作伴随状语的，也是一种独立主格结构，通常情况下可省略