Unit 3 The Internet Period 4 Discovering Useful Structures（精讲课件+同步练）- 2023-2024学年高一英语上学期同步精品课堂（人教版2019必修第二册）

Unit 3 : The Internet Period 4 : Discovering Useful Structures 人教版2019必修第二册 Teaching objectives 1. Identify and summarize the form and the functions of the present perfect passive voice; 2. Compare the present perfect passive voice with the active, and change the active form into the passive form; 3. Apply the present perfect passive voice into use; Lead in Read the pairs of sentences. Underline and compare the different verb forms. Jan's life has been greatly improved by the Internet. The Internet has greatly improved Jan's life. Much has been written about the wonders of the World Wide Web. People have written much about the wonders of the World Wide Web. passive voice passive voice The Present Perfect Passive Voice How do we form the present perfect passive voice? Verb form Active have\has +v-ed Passive _________________ have\has been +v-ed 1. 被动语态现在完成时形式 A. 陈述句： 主语+ have/has (not) +been+done B. 疑问句： (疑问词)+ have/has +主语+been+ done? 2. 被动语态现在完成时的用法 (1) 表示某一被动动作发生在过去(现在说话前)，但与现在的情况有联系。常与下列时间状语连用：just, already, yet, before, recently, lately, so far等。 The door has been locked. 门已经被锁上了。 （现在说话时门是锁着的）Compare: The door was locked. 门当时是锁着的/被锁上了。 （与现在说话时门的状态无关，可能锁上或重新打开了）。 The Present Perfect Passive Voice The Present Perfect Passive Voice (2) 表示某一延续性的被动动作或状态从过去某时一直延续到现在说话时，并有可能继续下去。与since, for , all day, in/for/over/ during the past/last few years 等表示的时间状语连用。 E.g. The bank has been closed since July/for several weeks. 自从七月以来银行一直关门/已经关门好几个星期了。 E.g. The child has been taken care of by Grandma Wang all these years. 这多些年来这孩子一直又王奶奶照看。 The Present Perfect Passive Voice (3) 用在时间和条件状语从句中, 表示将来某时已完成的动作。如： E.g. We’ll start out as soon as the work has been finished. 工作一完成我们将出发。 注意：下来情况下用被动语态： 1.强调动作的承受者，即动作的承受者是谈话的中心。 2.不知道或不必要或为了委婉 /礼貌, 不便说出动作的发出者。 3.当动作的执行者带有较长的定语。 Summary Tips: 常与现在完成时连用的时间状语(是否都用完成时) already 已经　　　　　 yet 已经 recently/lately 最近 since then 从那时起 ever since 自那以来 ever 曾经 so far 迄今为止 for a long time 很长一段时间 by n