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1、 Unit 3 The world of sciencePeriod 4 GrammarShe has finished her homework.Someone has broken the window.Activity 1 Describe the pictures with Present perfect tense.表示说话时已经完表示说话时已经完成的动作，而且这成的动作，而且这个动作的结果对现个动作的结果对现在仍有在仍有影响影响He has taught in our school for 30 years.表示动作发生在过表示动作发生在过去，但一直持续到去，但一直持续到现在，并且
2、有可能现在，并且有可能继续持续下去继续持续下去The enemy has killed you.You have been killed by the enemy.Activity 2 Compare the sentences and find out the difference被动被动1.I guess you have been asked about the title of your book before.2. I guess someone has asked you about the title of your book before.3.New inventions li
3、ke 3D printers have been used to make replacement hearts and bone parts.4. People have used new inventions like 3D printers to make replacement hearts and bone parts.找出下面句子的找出下面句子的谓语谓语结构，哪些是结构，哪些是主动主动？哪些是？哪些是被动被动？被动被动主主动动主主动动1. The New Age of Invention has just been published.2. In addition, importa
4、nt advances have been made in medicine and environmental science thanks to increasing computer power.3. Ive also been told that youre an inventor yourself.4. Nothing like this has been invented yet and Id sayLook for more sentences with the present perfect passive.现在现在完成时完成时1.现在完成时现在完成时谓语谓语结构结构 主动主动
5、被动被动have/has donehave/has been done2.常连用的时间状语有：常连用的时间状语有： recently , for+段时间，段时间，since +时间状语时间状语(从句从句)，these days, so far, up to now, in/ during/ over the last/ past few years/months/ weeks/hours1.表表过去开始的被动动作一直持续到过去开始的被动动作一直持续到现在现在.Activity 3 Explanation:现在完成时的被动语态现在完成时的被动语态His Chinese has been impr
6、oved a lot since he came to China.1.表表过去开始的被动动作一直持续到过去开始的被动动作一直持续到现在现在.Activity 3 Explanation:现在完成时的被动语态现在完成时的被动语态Rowlings novels have been translated into many foreign languages so far.2) 表某被动动作对现在造成的影响或表某被动动作对现在造成的影响或结果结果 The road has already been built for more than one year.happen, take place,br
7、eak out, belong to, cost,last等等不及物动词或不及物动词或词词无无被动语态被动语态。e.g. Great changes havetaken place in China since1978.1.Rewrite the underlined parts using the present perfect passive.Within the next 80 years, our lives may be changed beyond recognition by 3D printing. It has already affected many things in
8、our lives, right down to the food we eat. For instance, some restaurants in London have served 3D-printed hamburgers to customers. Many things in our lives have3D-printed hamburgers have been served to customers in some restaurants in London.already been affectedActivity 4 ConsolidationBut perhaps t
9、he most significant success that people have achieved to date is in medicine. They have made human body parts, including a beating heart, with 3D printing technology. And it is not just humans who are benefiting- in Brazil, people have given a new 3D-printed shell to a turtle injured in a forest fir
10、e!But perhaps the most significant success that has been achieved to date is in medicine. Human body parts, including a beating heart, have been made with 3D printing technology.A new 3D-printed shell has been given to a turtle injured in a forest fire!2. Imagine you are Dr Moore. Look at the pictur
11、es and tell the police about the damage and loss to your lab. Use the present perfect passive where appropriate.The window has been broken.The lock on the door has been broken.My two laptops have been stolen.Beakers and test tubes have been destroyed.The book case has been opened, and some files hav
12、e been taken away while others have been thrown everywhere.The robot has been damaged.3.用括号内动词的正确形式填空。用括号内动词的正确形式填空。1. The same mistake _ (make) many times. 2. More than 100 famous films _ (show) in the city since July. 3. For his tenth birthday, Carl wanted a bicycle but _ (give) a guitar by his pa
13、rents.4. Although it _ (play) many times, he still loves it. 5. Three new schools _ (open) in our city in the past 5 years.has been made have been shownwas givenhas been playedhave been opened Review grammar. Read the text on Page 26-27 again and underline all the sentences of the present perfect and present perfect passive voice.