Unit3 The World of Science P2 grammar & writing 课件+学案-2021-2022学年外研版（2019）高中英语必修三

Unit 3 The World of Science Period 2 grammar & writing Every great advance in science has issued from a new audacity of imagination. —Emerson Learning aims: Review the grammatical rules about the Present Perfect Passive and can use it correctly in different contexts. Read an experiment report and understand the structure of an experiment report. Learn how to write an experiment report. Step 1 【回顾】关于现在完成时态，你能想起些什么？ 1.什么时候用现在完成时态？标志性时间状语有哪些？ 已完成：发生在过去的动作，已完成，强调对现在产生的结果或者影响;常与before，already, never，ever，yet等连用； 未完成：某个动作从过去一直持续到现在，还有可能继续延续下去；常与recently, lately，ever since，since then, so far，until/till now,up to now, in/during/ over the past/last...years，these days, for+时间段等连用 2.特殊句式有哪些？ It is/has been＋一段时间＋since从句 This/That/It is the first/second/... time that＋现在完成时 Part 1 Present Perfect Passive 当主语是动作的承受者时，用被动语态： have/ has been done Step2 They _____________(tell) many times not to make noises. 他们被多次告知不要喧哗。 _____ his bike ____________________ ? 他的自行车修好了吗? The books ___________________________by the students.那些书还没有被学生们借走。 注意：现在完成时态的一般疑问句和否定形式。 The bridge ___________(build) last year.   Great changes ____________(take) place in my hometown. So far, many villages _______________(visit). The party ___ _____ _______(plan) since the New Year. With the help of high technology, more and more new substances ________________(find) in the past few years. 注意：一般过去时态仅表示发生在过去的动作，而现在完成时态强调过去动作对现在的影响。 have been told Has been repaired have not been borrowed was built have taken have been visited has been planned have been found Part 1 Present Perfect Passive Step 3 Exercise Activity 2: Rewrite the underlined parts using the present perfect passive. 1. Many things in our lives have already been affected. 2. For instance, 3D-printed hamburgers have been served to customers in some restaurants in London. 3.But perhaps the most significant success that has been achieved to date is in medi