Q: "A man is building a large sand castle on the beach." Does this mean that "A man is in the sand and working on putting together a sand castle."?
A: yes

Q: "The man is standing on the sidelines looking at people holding blue signs." Does this mean that "A man is standing and watching people."?
A: yes

Q: "Three people discuss the setting up process for a social event." Does this mean that "Three people are currently sleeping."?
A: no

Q: "Several people are riding motorcycles down a narrow street." Does this mean that "People are wearing helmets."?
A:
it is not possible to tell