Unit 3 The Internet Discovering Useful Structures 课件-2023-2024学年高中英语人教版（2019）必修第二册

Unit 3 The Internet Grammar By Ellen 现在完成时： have/has done 1.过去的动作一直持续到现在 I have lived in China for 5 years. 我在中国住了5年。（从5年前到现在，现在还在中国） 2.过去的动作对现在产生影响 Someone has broken the window. (窗户现在是坏的) I have already lost the key. (我现在没有钥匙) I haven't read the book yet. (不了解书的内容) Look at the sentences, pay attention to the red part. 1.Over time I have been changed a lot. 2.The party has been planned since the new year. 现在完成时被动语态：have /has been +done 肯定式： have/has been done... 否定式： have/has not been done... 一般问句： Have/Has+主语+been done 特殊疑问句： 疑问词+have/has+主语+been done 现在完成被动语态的基本结构 The singer has been invited (by Tom) . The singer has not been invited (by Tom) . Has the singer been invited (by Tom) ? Who has been invited (by Tom) ? 否定 一般疑问 对宾语提问 三、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 till/to 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。 The machine has been repaired for two hours. 这台机器已经被修了两个小时了。(可能还会继续被修) Tall buildings__________________(build) everywhere. have been built Shopping centers ___ (rebuild). have been rebuilt More than 50 new factories __ (set up) to improve economies so far. have been set up 注意事项 1.不及物动词和不及物动词短语，没有被动语态，如：rise , happen, take place, break out, come about, survive, last, die, disappear, end, fail, belong to, consist of... Great changes have taken place in my hometown recently. 注意事项 2.一般说来，只有及物动词才有被动语态，但许多“不及物动词+副词或介词”构成的短语动词，相当于及物动词，也可以有被动语态，但变被动语态后，不可把介词或副词漏掉. laugh at, listen to , look after, take care of, think of , talk about , hand in, catch sight of, make use of, pay attention to, My sister will be taken care of by grandma. The radio was turned on by him just now. 1. The problem ______________ (discuss) for 2 days. 2. Many new buildings ___________ (build) in the past few years. 3. Two nove