3. (+) Elizabeth is sweeping the floor.
(-)..... Elizabeth is not sweeping the floor.
(?) Is  Elizabeth sweeping the floor.?
4. (+) It is raining cats and dogs today.
(-)It is not raining cats and dogs today.
(?)is It raining cats and dogs today/?
5. (+) My family is going to the park right now.
(?)is My family going to the park right now?