2015-2016学年人教版高中英语必修3 unit4 language points(32张)
2015-2016学年人教版高中英语必修3 unit4 language points(32张)第3页

 be to (do): (something) will definitely happen, or it must happen 将来不可避免要发生或注定要发生

e.g.They said goodbye, little knowing that they were never to meet again. She is to be honoured for this great work. As a young man he didn’t know that he was to become famous later on.