People are gathered in a park.
A man is alone on an empty beach.
People gathered implies that the man is not alone.
exists e1 x1 x2.(in(e1,x2) & n_park(x2) & Theme(e1,x1) & v_gather(e1) & n_people(x1))
exists s1 s2 x1 x2.(on(s1,x2) & n_beach(x2) & a_empty(s2) & Theme(s2,x2) & Theme(s1,x1) & a_alone(s1) & n_man(x1))