Unit 2 Sports culture Grammar and usage 课件-2021-2022学年牛津译林版（2020）高中英语选择性必修第二册

Unit 2 Sports culture Grammar and usage Grammar and usage Passive voice in the past continuous and past perfect tenses Step 1 Lead-in Translate: 老师进来之前同学们已经打扫完了教室。 老师进来时同学们正在打扫教室。 Before the teacher came in, students had cleaned the classroom. When the teacher came in, students were cleaning the classroom. Before the teacher came in, . When the teacher came in, . Before the teacher came in, by . students students the classroom the classroom had been cleaned had cleaned When the teacher came in, by . the classroom students were cleaning the classroom was being cleaning students 主动变被动：主变宾，宾变主，谓语变成be + done 过去完成时的被动形式：had been done; 过去进行时的被动形式：was/were being done. Step 2 Exploring the rules N