Unit 3 The world of science Grammar 课件-2021-2022学年高中英语外研版（2019）必修第三册

Unit 3 The world of science Period 4 Grammar 1 She has finished her homework. Someone has broken the window. Activity 1 Describe the pictures with Present perfect tense. 表示说话时已经完成的动作，而且这个动作的结果对现在仍有影响 He has taught in our school for 30 years. 表示动作发生在过去，但一直持续到现在，并且有可能继续持续下去 The enemy has killed you. You have been killed by the enemy. Activity 2 Compare the sentences and find out the difference 被动 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 like 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. 找出下面句子的谓语结构，哪些是主动？哪些是被动？ 被动 主动 主动 The New Age of Invention has just been published. 2. In addition, important advances have been made in medicine and environmental science thanks to increasing computer power. 3. I’ve also been told that you’re an inventor yourself. 4. Nothin