Помогите с английским пожалуйста

1.He was writing a letter when I came to his place. 2.He was doing his work while his brothers were playing football. 3.l fell down when I was playing football. 4.We were doing our homework when the rain started. 5.When the teacher was writing on the blackboard the new teacher came to the classroom, 6.When the telephone rang I was working in the garden. 7.l saw my classmates when I was walking down the street. 8.The rain started when we were watching the game