1, There are (some old people playing tai chi) in the park.
2. There are (a group of big mothers dancing in the park).
3. There are (a group of children playing hide-and-seek) in the park.
4. In the park, there are (some couples walking hand in hand).
5. There are (many beautiful flowers) in the park.
6. There are (many old people playing chess) in the park.