Поставьте предложения в вопросительную и отрицательную форму.
1)Kate is a home.
2)My grandfather was a doctor.
3)He will be 17 in a month.

Is Kate  at home?     Kate isn't at home.

Was your grandfather a doctor?     My grandfather wasn't a doctor.

Will he be 17 in a month?        He won't be 17 in a month.