К каждому предложению задать общий вопрос,вопрос к подлежащему и спец.вопрос

Must Greta write a letter at 5 oclock
Who must write a letter at 5 oclock
when must Greta write a letter
must Boris go to school in the morning
who must go to school in the morning
where must Boris go in the morning
must Mike have dinner at 12 oclock
Who must have dinner at 12 oclock
what must Mike have at 12 oclock