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 comes to school at a quarter to nine.
2. Did you work very much last year?
3. Next mounth our friend won't 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 ? (?)