Negative
Mary isn't visiting her granny in the country now.
Interrogative
General Question
Is Mary visiting her granny in the country now?
Alternative Question
Is Mary visiting her granny or her aunt in the country now?
( Is Mary visiting her granny in the country or in the hospital now?)
Disjunctive Question
Mary is visiting her granny in the country now, isn't she?
Special Question
Where is Mary visiting her granny?
Who is visiting her granny in the country? (Специальный вопрос к подлежащему)