Q: "A man stands at the entrance of Yerba Buena Center for the Arts." Does this mean that "A man is by an art center."?
A: yes

Q: "A worker is cleaning the streets after a heavy rain." Does this mean that "A person cleaning"?
A: yes

Q: "A father and his children picking out a Christmas tree." Does this mean that "A family is going out to buy a christmas tree together"?
A: yes

Q: "Many of the people were wearing white clothing with red bandannas, as they celebrated in the streets." Does this mean that "People are celebrating the election in the streets."?
A:
it is not possible to tell