Объяснение:
1. Do they paint their room?
What do they paint?
Who does paint the room?
Do they paint their room or flat?
Do they paint their room, don't they?
2. They painted their room.
They painted their room, didn't they?
What did they paint?
Who did paint the room?
Did they paint their room or garage?
3. They will paint their room.
They will paint their room, won't they?
What will they paint?
Who will paint the room?
Will they paint their room or house?