上册Unit22高一英语课件

这个动作发生或完成在谓语动词表示的动作之前，表示一个已经完成的动作，相当于状语从句，Unit 22reading 21Having enjoyed the rides at the headland， =When they have enjoyed the rides at the headland visitors eg having made full preparations ， we are ready for the examination Having been shown the lab，visitors … 这是ving的完成形式， we were taken，