Ответ:
1. Dad sings well.
Dad does not sing well.
2. These children go to school in the morning.
These children do not go to school in the morning.
3. Mary runs in the park in the afternoon.
Mary does not run in the park in the afternoon.
4. Dogs swim very well.
Dogs do not swim very well.
5. My brother plays the piano.
My brother does not play the piano.
Объяснение: