Ответ:

  1. I did not play with my dog in the park yesterday.
  2. My dad worked at a hospital and helped people feel better.
  3. Yesterday, I saw a beautiful sunset over the ocean.
  4. I did not find my keys when I went to school.
  5. They all had dinner together last Sunday.
  6. Can you take this package to the post office for me?

После модального глагола can используется начальная форма глагола: take.