Unit 3 The lnternet Discovering useful structures课件-2025-2026学年高中英语人教版必修第二册

Unit 3 The Internet Discovering useful structures present perfect passive voice 1 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 6 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 7 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 years 在过去的几年里 主动语态变被动语态的原则 “三变” 例：They have built nine parks. 原句主语 by的宾语 宾语 主语 谓语由主动 被动 “三不变” 原句意思不变 原句时态不变 原句主谓宾以外成分不变 Nine parks _________________ by them. have been built Please find out the differences between the two pictures. Sentence pattern： “… has been …” e.g. One apple has been eaten. 眼力大比拼 1. Paper money ____________ (use) for over a thousand years. 2. — _____ the letter __________ (give) to Mr. Black? — No. It’s still on the desk. 3. Great changes ___________ (take) place in my hometown and a lot of factories ____________ (set) up. has been used Has been given have taken have been set Complete the sentences. Complete the sentences. 4. —How long _____________________ (employ) at this job? —Since 1999. 5. When and where to go for the on-salary holiday __________________ (not, decide) yet. 6. I like these English songs and they ______________ (teach) many times on the radio. 7. All the preparations for the task __________________ (complete), and we’re ready to start. have been taught have been completed has not been decided have you been employed SUMMMARY 现在完成时的被动语态 含义 结构 表示过去发生的被动动作现在已经完成或仍将持续, 强调对现在的影响 have/has been done 形式 肯定式 否定式 疑问式 have/has been done have/has not been done Have/Has+主语+been done 特殊疑问词+have/has+主语+been done 用法 表示已经完成的被动动作 表示过去开始的被动动作一直持续到现在 表示某被动动作对现在造成的影响或结果 注意事项 动词短语不可分割也不可省略其中的介词和副词 不及物动词或词组无被动 Change the sentences into the present perfect passive voice. They’ve built a kind of new PC with more functions. A kind of new PC has been built with more functions. EXAMPLE ↓ I have downloaded the software to help my phone battery last longer. Someone has lost an identity card. The software has been downloaded to help my phone battery last longer. An identity card has been lost. Have you confirmed the Wi-Fi password? Have you pressed the button yet to copy the file? Has anyone made a comment about the online database? Has the Wi-Fi password been confirmed? Has the button been pressed yet to copy the file? Has a/any comment been made about the online database? Exercises 1. First as a PC and then as a laptop, I_________________(use) in offices and homes since the 1970s. 2. Over time my memory ________________ (develop) so much that I never forget anything I ________________(told). 3. Since the 1970s many new applications _________________ (find)for me. 4. I have also ___________(put) into robots and used to make mobile phones as well as________ (help) with medical operations. has developed have been told have been used have been found been put help Thank you 23 Lavf58.19.102 $$