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课件网) Unit 3 The Internet Discovering useful structures present perfect passive voice Active and passive voices 单击输入您的封面副标题 Lead-in 被动语态复习 一、什么是语态？ 语态是英语动词的一种表现形式，用来说明_____和_____之间的关系。 二、语态的种类：_____和_____ 主语 谓语动词 主动语态 被动语态 挑事儿： If you think you're such a tough guy, then hit me. You hit me! Come and help me! I was hit / beaten. present(now) future past 过去的动作一直持续到现在 过去的动作对现在产生影响 The Present Perfect Tense 现在完成时 have/has done 主动 现在完成时 被动语态 have/has been done 现在完成时的被动语态 be done have/has done How do we form the present perfect passive voice 现在完成时的被动语态 Jan's life has been greatly improved by the Internet. Much has been written about the wonders of the World Wide Web. Let’s learn Read the pairs of sentences. Underline and compare the different verb forms. The Internet has greatly improved Jan’s life. People have written much about the wonders of the World Wide Web. 主动 被动 Verb form (动词形式) How do we from the present perfect passive voice Fill the blank. Active(主动) have/has + v-ed Passive(被动) _____ have/has + been v-ed 现在完成时(主动语态) 结构：have/has + done 现在完成时(被动语态) 结构：have/has + been done 主语 + have/ has + been + V-过去分词(been done) 助动词,无意义 一、现在完成时的被动语态 结构 Many students have already been affected by the virus of Omicron. 肯定句 Many students have already been affected by the virus of Omicron. Have many students been affected by the virus of Omicron yet Who have been affected by the virus of Omicron yet ①否定句： Many students have not been affected by the virus of Omicron yet. ②一般疑问句： ③特殊疑问句（对划线部分提问）： 主语 + have/has+ not + been + done... Have/Has + 主语 + been + done...？ 疑问词 + have/has + 主语 + been + done...？ 二、现在完成时的用法 (1) 表示到现在为止已经完成或刚刚完成的动作。 Eg： ① Now we have planted all the trees. ② He has just come back. ③ They have built many buildings in this city. Someone has broken the window. I have already lost the key. I haven’t read that book yet. I have just cleaned my hands. 二、现在完成时的用法 (2) 表示过去发生的动作, 强调结果或对现在的影响。 常与already, yet (到现在还没有), just (刚刚), ever 等词连用. already: 常用于肯定句中 yet: 常用于否定句,疑问句尾 (窗户现在是坏的) (我现在没有钥匙) (不了解书的内容) (手是干净的) She has learned English for 5 years. 她学英语有五年了。 He has lived in Beijing since （自从） 5 years ago. 他五年前就住在北京了。 二、现在完成时的用法 (3) 表示从过去开始并持续到现在的动作或状态，常与包括现在在内的一段时间的状语连用。 for＋时间段（一段时间） 常与现在完成时连用的时间状语有： already 已经 yet 已经 recently/lately 最近 since then 从那时起 ever since 自那以来 eve 曾经 so far/up till now 迄今为止 by now 到现在为止 for a long time 很长一段时间 in recent years 在最近几年里 in/during/over the past/last yea ... ...
