2019-2020学年人教版高中英语必修3课件:Unit 4 Astronomy the Science of the stars Period 2 课件(2)
2019-2020学年人教版高中英语必修3课件:Unit 4 Astronomy the Science of the stars Period 2 课件(2)第1页

Language points

1. be to do 计划,命令,义务,注定发生,想要 The train is to arrive in Beijing at 10:25. You are to be back by 9 o’clock. She is to be honored for her great work. The flowers should be watered if they are to survive.