讲解细致、全面,适合新授课
现在分词被动式: (4) 一般式的被动式 (being done) : 如果现在分词的动作是被动的，且是正在进行 或与谓语动词的动作同时发生，就用being done 完成式的被动式 (having been done ): 表示发生在谓语动作之前的被动动作. The building being built will be a store. Having been given such a good chance, how could he let it slip ?