就是with + 宾语（名词或代词）+ 宾补（介词短语,形容词,副词现在分词,过去分词,不定式）,是一个独立主格结构,在句中做状语,可表原因,伴随等.
例句：The teacher came in with a book in his hand.老师手里拿着一本书进来了.
With a lot of work to do,I have no time go out with you.(不定 式表将来动作)有许多工作要做,我没时间和你一起出去.
We found the house easily with the little boy leading the way.(现在分词表示主动动作,即分词所表示的动作是由with后的宾语发出来的)
With all the things she needed bought,she went home happily.(过去分词表示被动,with后面的宾语与过去分词之间是被动关系)