З якой даты пачынаецца дзяржаўнасць на Русі? «Аповесць мінулых гадоў»

1. Sam said to me that he had been reading that book for the whole night 
2. I didn't know that you had worked at Hermitage.
3. We didn't know where our friends went every day.
4. We found that she left home at 8 o'clock every morning
5. Sam said to me that he had been reading that book for the whole week
6. Mother thought the children were playing football in the yard.
7. The doctor asked me when I had caught cloud.
8. I was told he had returned from London 
9. I knew that mother was sleeping
10. I supposed that he would send us a letter.