Mai is my best neighbour. (Subject focus). 2.Jonh took my book away last night (Subject focus)

1.Mai is my best neighbour. (Subject focus)
2.Jonh took my book away last night (Subject focus)
3.The school is being rebuilt now.It was damaged by the storm last week (ĐTQH)
4.Are you the last person? You left the office yesterday(ĐTQH)
5.My grandfather built the house in 1970 (object focus)
6. You must do your homework before class (Cleft in passive)