高中英语 Unit 3 The world of science Section Ⅲ Using language教学案 外研版必修第三册-外研版高一第三册英语教学案VIP专享

Section Ⅲ Using language现在完成时的被动语态现在完成时是过去的动作或状态持续到现在并且已经完成，对现在造成的影响，可能持续发生下去。have/has been done 是现在完成时的被动语态结构，主要用来表达动作已经被做，已经被完成，或者尚未被完成。[观察例句]阅读下列句子，并体会黑体部分的用法。1．I guess you have been asked about the title of your book before.2．New inventions like 3D printers have been used to make replacement hearts and bone parts.3．I guess someone has asked you about the title of your book before.4 ． People have used new inventions like 3D printers to make replacement hearts and bone parts.5．Something bad has happened to him.6．The door has opened of itself.7．The orphan has been well looked after.[归纳用法]现在完成时被动语态用法是高考的重要考点，学习时应该注意下列几点：一、掌握现在完成时被动语态的构成现在完成时被动语态的结构为 has/have been done，使用 has been done 时主语为单数，使用 have been done 时主语为复数。如：This book has been translated into many languages.这本书已被译为多种语言。His bikes have been sold out.他的自行车已经卖完了。二、理解现在完成时被动语态的概念现在完成时被动语态强调一个发生在过去的被动性动作，它有两层意思：(1)动作已经完成，强调对现在造成的影响或结果：(2)主语与谓语动词之间为被动关系。如：Our classroom has been cleaned，you needn't clean it now.我们的教室已经被打扫过，你现在没必要再打扫了。These flowers have been watered，you can go home.这些花已经被浇水了，你可以回家了。三、现在完成时被动语态的用法1．用于不知道动作执行者是谁时His bike has been stolen.他的自行车被人偷了。(不清楚是被谁偷的)2．用于动作执行者是泛指或不言自明时Not a book in the library has been taken away.1图书馆里的书没有一本被人拿走。(没人拿书，泛指)3．用于可以说出动作执行者但动作承受者是谈话中心或特别需要强调时My watch has been repaired.我的表修好了。(表修好了是谈话的主旨，是谁修好无关紧要。不必提及)4．用于出于委婉、礼貌而避免提及自己...