Unit 3 Food and Culture Discover useful structures课件 2023-2024学年人教版高中英语选择性必修第二册

Discovering useful structures Unit 3 Food and Culture The past perfect tense and its passive voice 1 过去完成时表示在过去某个时间或动作之前已经发生或完成了的动作或存在的状态， 即“过去的过去（ past-in-the-past ）”。　　　　　 过去完成时的概念与结构特点: past in the past past now 表示由过去的某一时刻开始，一直延续到过去另一时间的动作或状态，常有for，since的时间状语表示动作延续。 1.Kevin had been a newspaper reporter for two years [before he became a businessman.] [典例1] 1. He said he ____________ (work) in that factory since 1949. 2. I had been at the bus stop for 20 minutes when a bus finally _______ (come). had worked came 4. 在by, by the end of, by the time, before后接表示过去某一时间的短语或从句。 e.g. By the end of last year, we _____________ (produce) 20, 000 cars. The train ________ (leave) before we reached the station. had produced had left By nine o'clock last night，we ________(get) 200 pictures from the spaceship. had got /40 [典例1]By the end of June, they _____________ (treat) over 800 patients. had treated By the time the policeman _______(get) to the shop, Tom __________(run) away. got had run 1. 过去完成时常常用在told，said，knew，heard，thought 等动词后的宾语从句中，这时从句中的动作发生在主句表示的过去的动作之前。 e.g. She said (that) she ___________(be) to Paris. Basic usage 6 had been I thought I __________(send) the letter a week before. had sent /40 2. 状语从句 在when, before, after, as soon as, till, until等引导的状语从句中，在过去不同时间发生的两个动作中， 发生在先，用过去完成时； 发生在后，用一般过去时。 e.g. When the police arrived, the thieves ____________ (run) away. When she returned home, she found that all her furniture ______________(ruin) by the flood. had run had been ruined /40 3. 动词如want, hope, plan, wish, expect, think, intend, mean等用过去完成时来表示过去未曾实现的打算，意图，希望，想法。（表示原计划打算做某事却没有做成） e.g. We __________ (hope) that you would come, but you didn’t. I ______________(intend) to see you , but I had to look after my baby. 8 had hoped had intended /40 4. 表示“一……就”的句型： “hardly/scarcely+had done+when did” “no sooner+had done+than did” I had hardly entered the room when the light went out. Ha