Q: "A man making cement risers." Does this mean that "A man builds risers for a new sports stadium."?
A: it is not possible to tell

Q: "A man, dressed in black, sits in a chair with a brass tuba beside him." Does this mean that "A man plays the piano in a bar."?
A: no

Q: "a boy and a woman walk into the ocean." Does this mean that "Two people walk into the ocean."?
A: yes

Q: "Two girls play a competitive game of frisbee." Does this mean that "Two girls are singing on stage."?
A:
no