People walking in a supermarket.
People shop in a busy supermarket.
Walking around in a supermarket does not mean you are necessarily there to shop, nor does it mean the supermarket is necessarily busy.
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 x2 x3.(a_topic(x1) & in(x1,x3) & n_supermarket(x3) & a_busy(s1) & Theme(s1,x3) & n_shop(x1) & of(x1,x2) & n_people(x2))