1当我到达学校时，学生们都已经放学了
2在我们进城以前，我们的汽车已经坏了，再也走不动了
3当我迟到20分钟到达机场时，他已经乘租出车去殡仪馆了
4当警察开始抓他时，他已带家属去加拿大
5她说在我来之前她们已经做好一切准备
參考答案:1 When I when arrive the school, the student is already to release from the school
2 at we go into the city past, our car is already bad, caned not walk anymore any further
3 when I is late 20 minuteses arrives the airport, he has multiplied by to rent the car went to the funeral home
4 when the police starts grasping him, he has taken the family members goes to Canada
5 she say at I to before they have worked well the whole preparation