11. He wasn't sleeping when father came home. He was doing his homework.
Он не спал, когда папа пришёл домой. Он делал свою домашнюю работу.
wasn't sleeping (не спал) - не спал в тот конкретный момент. Возможно, он спал почти всё время до прихода отца и даже лёг сразу после, но вот в конкретный момент прихода папы домой - не спал (и делал свою домашнюю работу).
12. When I was going to school the day before yesterday, I met Mike and Pete. The were talking and laughing. They told me a funny story. Soon I was laughing, too. I was still laughing when we came to school. After school I told this story at home. My father and mother liked it very much.
told - рассказал. Тут не описано, сколько времени занял процесс рассказа этой смешной истории, но известно, что история была рассказана.
13. When we were in the country last summer, I went to the wood one day. In the wood I found a little fox cub. It could not run. It injured its leg. I decided to help the cub. I brought it home. Every day I fed it and took care of it. I was doing it the whole summer. Now the fox cub is quite well. It left my house. It lives in the woods again.
11. He wasn't sleeping when father came home. He was doing his homework.
Он не спал, когда папа пришёл домой. Он делал свою домашнюю работу.
wasn't sleeping (не спал) - не спал в тот конкретный момент. Возможно, он спал почти всё время до прихода отца и даже лёг сразу после, но вот в конкретный момент прихода папы домой - не спал (и делал свою домашнюю работу).
12. When I was going to school the day before yesterday, I met Mike and Pete. The were talking and laughing. They told me a funny story. Soon I was laughing, too. I was still laughing when we came to school. After school I told this story at home. My father and mother liked it very much.
told - рассказал. Тут не описано, сколько времени занял процесс рассказа этой смешной истории, но известно, что история была рассказана.
13. When we were in the country last summer, I went to the wood one day. In the wood I found a little fox cub. It could not run. It injured its leg. I decided to help the cub. I brought it home. Every day I fed it and took care of it. I was doing it the whole summer. Now the fox cub is quite well. It left my house. It lives in the woods again.