He主 gave谓 the book宾 to his sister介词短语：状语.=He主 gave谓 his sister间宾 the book直宾.结构不一样，但意思是一样的。双宾语的间宾放在直宾后时，要加个介词。
He (主语)gave (谓语) his sister(间接宾语) the book(直接宾语).主谓双宾结构的 句子。
