Unit 2 Improving yourself Period 2 Using language 课件-【新教材精创】2020-2021学年高中英语新教材同步备课(外研版选择性必修第二册)

外研版英语 选择性必须必修第二册 Unit 2 Improving yourself Period 2 Using languages Part 1 Grammar Learning by contrast When the detox started, people had persuaded over 100 students to stop using social media for 7days. When the detox started, over 100 students had been persuaded over 100 students to stop using social media for 7days. Notes: 1. The students were persuaded before the detox started. 2. Sentense (a) uses the passive voice of the past perfect tense, while Sentense (b) uses the acitve voice of the past perfect tense. 3. The passive voice can be used to emphasize the acceptor of an action. Tense and Voice Past perfect tense Definition: The structure of the past perfect passive 1. 在动作发生的时间上，表示过去的过去； 2. 在语态上，主语与谓语动词构成被动关系； 3. 在过去某一时间已经完成而且造成一定的影响或者结果。 4. 根据语境可以判断出动作先后的过去完成时被动语态； The usage of the past perfect passive eg. Because the work had been done, he went on to search the Internet. a. From the adverbial “because-clause”, we konw that the acti