помогите поставить время к каждому предложению. ( время Past) нужно определить какое...

Question

1. It was evening. My mom was reading the book, and I was writting a letter. Suddenly my mother's brother came in. We had been talking for about an hour when his wife called and reminded him about the theater. 
2. Anna stepped out from the institute, got on the bus and went home. When she came home, her son was doing homework. While he was doing his homework, she was cooking the dinner. 
3. What were you doing yesterday at this time - I wrote a report in the library. I had been writting it for an hour, when my friends came to the library . 
- when you came back home? - late. 
4. With whom were you talking yesterday, when I met you on the street? - With frend. Two days ago he came back from London. We had been talking already about 15 minutes, when you saw us yesterday. 
5. What did you do yesterday at 10 pm? - I was in the hospital. I examined my patients. I had been examining them for an hour, when the professor came in.

Жанна Юрина · Accepted Answer

1. It was evening. (past simple). 
My mom was reading the book, and I was writting a letter. - (past continuous) 
Suddenly my mother's brother came in. - past simple 
We had been talking for about an hour(Past Perfect Continuous) when his wife called and reminded him about the theater.(Past simple) 
2. Anna stepped out from the institute, got on the bus and went home.(past simple) 
 When she came home,(past simple) her son was doing homework.(past Continuous) 
 While he was doing his homework, she was cooking the dinner.(past Continuous) 
3. What were you doing yesterday at this time(past Continuous) - I wrote a report in the library.(past simple) 
 I had been writting it for an hour, (Past Perfect Continuous) when my friends came to the library .(past simple) 
- when you came back home?(past simple) - late. 
4. With whom were you talking yesterday,(past Continuous) when I met you on the street(past simple)? - With frend. Two days ago he came back from London.(past simple) We had been talking already about 15 minutes, (past perfect continuous) when you saw us yesterday.(past simple) 
5. What did you do yesterday at 10 pm? - I was in the hospital. I examined my patients. I had been examining them for an hour, when the professor came in.