People walking in a supermarket.
The market is empty
The supermarket cannot be empty if people are walking in
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_supermarket(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists s1 x1.(n_market(x1) & Theme(s1,x1) & a_empty(s1))