a boy with a book
a boy with a book in his hand
第一句的介词短语是后置定语
第二句的 a book in his hand是什么成分,是伴随状语吗?in his hand如何理解?
with a book in his hand为with复合结构作定语。即with后接复合宾语(宾语+宾补)。
with复合结构既可以作状语,也可以作定语。
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