1)We have read all the exercises
2) My sister cleaned the room
3) Masha has never been in America
4) My brother works at the school
5) The older sister is listening to music now, and my brother playing a computer game
6)Tomorrow, my mother and I go to the museum
7) Yesterday, my grandfather was in the city
8) My mum was not at school yesterday.
9) My mother is sitting and watching TV now
10) My sister is reading an interesting book