(课件网) Discovering Useful Structures—The present perfect passive voice The Internet Unit 3 语境 感悟 阅读以下短文，感知加颜色部分，完成下面的练习 Dreams of finding lost treasure almost came true recently.A new machine called “The Revealer” has been invented and it has been used to detect gold which has been buried in the ground.The machine was used in a cave near the seashore where—it is said—pirates used to hide gold.The pirates would often bury gold in the cave and then fail to collect it.Armed with the new machine，a search party went into the cave hoping to find buried treasure.The leader of the party was examining the soil near the entrance to the cave when the machine showed that there was gold under the ground.Very excited，the party dug a hole two feet deep. They finally found a small gold coin which was almost worthless.The party then searched the whole cave thoroughly but did not find anything except an empty tin trunk.In spite of this，many people are confident that some valuable things have been revealed by “The Revealer”. 加颜色部分所使用的时态和语态是 ，其构成为： 。 自主发现 返 回 现在完成时的被动语态 have/has been＋过去分词 语法 精讲 现在完成时的被动语态表示到现在为止某事已经被完成或被做。 运用现在完成时的被动语态时应掌握以下几个方面： 一、现在完成时的被动语态的常用句式 肯定式 主语＋have/has been done... 否定式 主语＋have/has not been done... 一般疑问式 Have/Has＋主语＋been done...？ 特殊疑问式 疑问词＋have/has＋主语＋been done...？ He has been selected to take part in the sports meeting. 他已被选中参加这次运动会。 To Tom’s disappointment，his novel has not been published. 让汤姆失望的是，他的小说还没有被出版。 Has the date for the next meeting been decided 下次会议的日期已经确定了吗？ How many residents have been invited to the conference？ 有多少居民受到了参会的邀请？ 二、现在完成时的被动语态的用法 1.表示被动的动作在说话之前已经完成，强调过去的动作对现在造成的影响或产生的结果，通常与already，yet，never，recently等副词及时间状语so far，by now，up to/till now，since等连用。 The database has already been updated. 数据库已经被更新了。(现在可以使用新的数据库了) 2.表示一个被动的动作或状态从过去开始一直持续到现在，并可能继续持续下去，常与for或since等引出的时间状语(从句)连用，或用于由how long引出的句子中。 Financial problems of the company have been discussed for nearly two hours. 公司的财务问题已经被讨论了近两个小时了。(可能还会继续被讨论) 3.用在条件、时间状语从句中，表示从句动作先于主句动作完成。 You shouldn’t leave school before your homework has been finished. 在你的作业完成之前你不应该离开学校。 三、使用现在完成时的被动语态要注意以下六点问题 1.与一般过去时的被动语态的区别。一般过去时的被动语态所表示的动作或状态与现在的情况没有联系，而现在完成时的被动语态则强调与现在的情况有联系。 The park was opened to the public last year. 这个公园去年向公众开放。(说明动作发生于过去) The park has been opened to the public. 这个公园已向公众开放。(说明动作发生于过去，但对现在有影响， ... ...
