1. How long have Cathoaine and Hlanry been engaged? -> When 2.I last saw him whan I nas a student =) I haven't 3. It is ages since Alan visited his parents =) Alan hasn't 4. We will not see each other again before I go => This will be the last time 5. The train left before he got to the station => by he time 6. The school was founded ten years ago =) It is ten years 9. She hadn't had relapse for six months =>It was 8.I haven!'t forgone a meal for two years > The last time 9. No - one has challenged his aut horidy before => This is the fist time

`~rai~`

\(\text{1.When were  Catherine and Henry engagged?}\\\text{2.I haven't seen him since I was a student.}\\\text{3.Alan hasn't visited his parents for ages.}\\\text{4.This will be the last time we meet each other before I go.(không chắc lắm)}\\\text{5.By the time he got to the station,the train had left.}\\\text{6.It is ten years since the school was founded.}\\\text{7.It was six months since she last had a relapse.}\\\text{8.The last time I forwent a meal was two years ago.}\\\text{9.This is the first time his authority has been challenged.}\)