Эти предложения надо поменять на отрицательный и вопросительный.
1) My sister always comes to school at a quarter to nine.
2) Last year we didn't work very much.
3) Next month our friend will visit us.

1)My sister doesn't come to school at a quarter to nine.(-) Does my sister come to school at a quarter to nine? (?) 2)Did we work very much last year ? (?) Это и так отрицание 3) Next month our friends won't visit us (-) Will our ftiends visit us next month ? (?)