过去分词作伴随状语。原句相当于 I stood there and I was puzzled. 我困惑地站在那里（即“站在那里的同时，心里困惑着”。是一种伴随的状况）
又例如：She entered the classroom, and she was followed by some students.=She entered the classroom, followed by some students. 她走进教室，后面跟着几个学生。
不定式做定语
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