Unit 3 Computers Section Ⅲ Grammar-现在完成时的被动语态语法图解探究发现①Over time I have been changedquite a lot.②Since the 1970s many new applications have been found for me.③The important problem has been discussed for nearly two weeks.④The ink has not been removed from the clothes.⑤Haven't your problem been solved?⑥How many buildings have been built in your school?[我的发现](1)以上几句中的时态和语态是现在完成时的被动语态。(2)以上几句中第①②③句是该时态的肯定句式；第④句是否定句式；第⑤句是一般疑问句式；第⑥句是特殊疑问句式。一、结构肯定式主语＋have/has been done ...否定式主语＋have/has not been done ...一般疑问式Have/Has＋主语＋been done ...？特殊疑问式疑问词＋have/has＋主语＋been done ...？He has been selected to take part in the sports meeting.他已被挑选出来参加运动会。The construction of the bridge has not been finished.桥的建设还没有完成。Has the date for the next meeting been decided?下次会议的日期已决定了吗？How long has the battery not been changed?电池多久没有更换了？[即时演练 1](1)变换句子1The children have already been told the good news.① 将上面的句子变为否定句。The_children_haven't_been_told_the_good_news_yet.② 将上面的句子变为一般疑问句。Have_the_children_been_told_the_good_news_yet?③ 将上面的句子对 the children 进行提问。Who_has_been_told_the_good_news_yet?(2)补全句子①I'm sorry, but the letters haven't_been_typed yet.很抱歉，这些信件还没有被打印出来。②The plan has_been_discussed for nearly two hours.这项计划已被讨论了近两个小时了。③She hasn't_been_heard_from since then.从那时候起，她就没来过信。二、用法1．现在完成时的被动语态同它的主动语态一样，强调过去的动作对现在造成的影响或结果，通常与 already, yet, just, never, recently 等副词连用。The machine has already been repaired.机器已经修好了。2．表示一个被动的动作或状态开始于过去，持续到现在，并可能持续下去，常与 for 或since 引导的时间状语连用，...
