I taught my sister a song. (?)
Did I teach my sister a song?
She took a lot of photos. (-)
She didn't take a lot of photos.
Did he have a good time? (-)
He didn't have a good time.
He didn't eat his vegetables. (+)
He ate his vegetables.
Did you meet the new student? (+)
You met the new student.
We felt excited about the trip. (-)
We didn't feel excited about the trip.
Were you at home? (+)
You were at home.
She didn't read the instructions. (+)
She read the instructions.
They went to London last year. (?)
Did they go to London last year?
She bought a new phone. (-)
She didn't buy a new phone.
You did your homework. (?)
Did you do your homework?
They didn't give us a present. (+)
They gave us a present.
We didn't bring any food. (+)
We brought some food.
Did they catch the train? (-)
They didn't catch the train.
He left his bag on the bus. (?)
Did he leave his bag on the bus?