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课件网) Unit 3 The Internet Discovering Useful Structures He has lost his book - Why are you playing computer - I have finished my homework. 用法一： 动作结果对现在有影响 Past Now Future Tense 时态：现在完成时 影响性 构成 ： have/has+动词的过去分词 I have lived here since 2008. He has taught in our school for 30 years. 用法二：动作持续至今（未来未知） Past Now Future ？ Tense 时态：现在完成时 持续性 I have tried it for several times. Past Now Future 用法三：一段时间内多次重复的动作 We have had two tests this term so far. Tense 时态：现在完成时 重复性 Tense 时态：现在完成时 常见时间标志词： already, just, yet so far, up to now, recently, lately in the last/past few decades since + 时间点/时间状从; for + 一段时间 This/It is the first time + that + 现在完成时 Tense 时态：现在完成时 How to express these situations 1. 不清楚动作发出者 2. 突出动作承受者 The Passive Voice 被动语态 What is the form of the present perfect passive voice？ Read the pairs of sentences. Underline and compare the different verb forms. Jan's life has been greatly improved by theInternet. The Internet has greatly improved Jan's life. Much has been written about the wonders of the World Wide Web. People have written much about the wonders of the World Wide Web. 现在完成时主动态：have/has+动词的过去分词 现在完成时被动态： have/has + been+动词的过去分词 P 30 陈述句 主语 + have/has been + V-ed （肯定） 例1：Her motorbike has been stolen. 她的摩托车盗了。 一般疑问句 Have/has + 主语 + been +V-ed +... 特殊疑问句 特殊疑问词 + have/has + been +V-ed +... 例2：Have they been sent abroad to study English 他们已经被派往国外学英语了吗 例3：Who has been invited 谁受到了邀请？ 现在完成时被动态 主语 + have/has not been + V-ed （否定） 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, like an elephant, I never forget anything I _____(tell). 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. 5. I _____(put) into space rockets and sent to explore the Moon and Mars. has developed have been told have been found been put help have been put have been used Fill in the blanks with the correct form of the words in the bracket. 表示说话时正在进行的被动动作,表示“某人/事此时此刻正在被…” 强调主语是动作的承受者。提示词常有now, at present, right now, at the moment等词. 表示现阶段正在进行的被动动作, 但此动作不一定在此时此刻发生。 表示按计划或安排将要进行的一个被动动作。 表示经常的被动行为, 常和always, often, constantly, never等频度副词连用，含有一种赞扬、责备、厌恶或埋怨等感彩。 Eg：He is always being praised by his efforts on study. 现在进行时的被动语态 is/am/are being done Change the sentences into the present perfect passive voice. EXAMPLE They've built a kind of new PC with more functions. -- A kind of new PC has been bui ... ...
