1.when you left home in the morning was it raining? （过去进行时）
2.where did you study before you came to our school?
3.I didn't have supper until I finished my homework.9not until 句型)
4. They had lived in guangzhou before they moved to shanghai. (过去完成时态)
5. They didn't have a rest until the volleyball match was over.(not until 句型)