非谓语动词
29. （2014江苏）The lecture ________, a lively question-and-answer session followed.
A. being given B. having given C. to be given D. having been given
【答案】D
31.(2012江苏) an important decision more on emotion than on reason, you will regret it sooner or later.
A. Based B. Basing C. Base D. To base
31. 【考点】非谓语动词—动词现在分词做状语
【答案】B
【解析】动词base与逻辑主语you之间构成主谓关系，所以用现在分词作状语，故选B项。
【举一反三】1）现在分词的主动语态：
现在分词主动语态的一般式表示与谓语动词所表示的动作同时发生，完成式表示的动作在谓语动词所表示的动作之前发生，常作状语。如：
They went to the park, singing and talking. 他们边唱边说向公园走去。
Having done his homework, he played basketball.做完作业，他开始打篮球。
2）现在分词的被动语态：
