常见题型：choice、fill、short
例题 1
The lecture, ______ (deliver) by a famous professor, was well received by the students.
解答
句中 The lecture 与 deliver 之间是被动关系，deliver 的动作由 by a famous professor 引出。此处用过去分词短语 delivered by a famous professor 作后置定语，修饰 The lecture，表示“被一位著名教授讲授的讲座”。主句谓语是 was well received，句子结构完整。若填 delivering，则 lecture 会被理解为 deliver 的执行者，语义不符；若填 to deliver，也不能构成合适的后置定语。因此空白处填 delivered。完整句子为：The lecture, delivered by a famous professor, was well received by the students.
解析：
本题考查分词作定语。lecture与deliver之间是被动关系，且动作已完成，故用过去分词delivered。
要点：
例题 2
______ (not know) how to solve the problem, the student turned to the teacher for help.
解答
本题考查分词作状语。student与know之间是主动关系，且否定形式需在分词前加not，故用Not knowing。
解析：
本题考查分词作状语。student与know之间是主动关系，且否定形式需在分词前加not，故用Not knowing。
要点：