with的复合结构,在句中一般充当两种成分：状语和后置定语.
其中以作状语常见常考.
如：The teacher entered the classroom,with a book in his hand.
with a book in his hand做伴随状语
再如：Do you know the boy with a book in his hand?
with a book in his hand做the boy的后置定语
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