Past ProgressiveAt 2 pm yesterday, I was doing my homework.
- действия происходили одновременно (while=пока)
She was doing homework while he was watching TV.
- действие длилось, но было прервано......
She was doing her homework, when her mum came home.
Past SimpleI did my homework yesterday.
- действия происходили друг за другом
She did her homework, and then she watched TV.
- ..... действие, которое прерывает действие в Past Progressive
When mum came home, she was doing her homework.