Unit 3 Discovering Useful Structures 课件-2022-2023学年高中英语人教版（2019）必修第二册

Unit 3 The Internet Discovering Useful Structures 现在完成时 被动语态 The Internet is becoming the town square for the global village of tomorrow. -Bill Gates present(now) future past ① 不明确的过去时间开始的情况一直持续到现在 ② 不明确的过去时间的行为在现在的结果 The Present Perfect Tense We have studied in senior high school for more than half a year. 时间状语 just; already; ever; never; yet; so far; by now 不明确的时间 一段时间 for 3 days; since 3 days ago 包括说话时间的 时间 this morning, this week, this month, this year Talk about something that has been done 现在完成时的被动语态 Read the pairs of sentences. Underline and compare the different verb forms. Jan’s life has been greatly improved by the Internet. Much has been written about the wonders of the World Wide Web. The Internet has greatly improved Jan’s life. People have written much about the wonders of the World Wide Web. 1 Read the pairs of sentences. Underline and compare the different verb forms. Jane's life has been greatly improved by the Internet. The Internet has improved Jane's life. Read and compare The first one is passive form, while the second one is active. has been v-ed has v-ed Much has been written about the wonders of the World Wide Web. People have written much about the wonders of the World Wide Web. Read and compare The first one is passive form, while the second one is active. 1 Read the pairs of sentences. Underline and compare the different verb forms. has been v-ed has v-ed The students have cleaned the classroom. The classroom has been cleaned. You needn’t clean it now. 现在完成时 active passive 表示说话时已经完成的被动性的动作或结果,主语是动作的承受者。 现在完成时的被动语态 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 been How do we form the present perfect passive voice? 现在完成时的被动语态 肯定式: 主语 + have/has+ been + done(V-过去分词) 否定式: 主语 + have/has+ not + been + done... 一般疑问句: Have/Has + 主语 + been + done...? 特殊疑问句: 疑问词 + have/has + 主语 + been + done...? 现在完成时的被动语态的结构 肯定形式: His homework has been finished. 否定形式: His homework has not been finished. 一般疑问句: Has his homework been finished yet? 特殊疑问句: