A person in a green shirt on a skateboard jumping off of a short set of stairs.
A person is skateboarding with friends.
They could be alone - there is no indication that there are any friends there.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & on(x2,x3) & of(e1,x5) & of(x5,x6) & n_stair(x6) & n_set(x5) & a_short(s2) & Theme(s2,x5) & r_off(e1) & Actor(e1,x4) & v_jump(e1) & (x3 = x4) & n_skateboard(x3) & n_shirt(x2) & a_green(s1) & Theme(s1,x2) & n_person(x1))
exists e1 x1 x2.(with(e1,x2) & n_friend(x2) & Actor(e1,x1) & v_skateboard(e1) & n_person(x1))