People walking across a crosswalk.
People are crying at the party.
People cannot walking across a crosswalk and crying at the party simultaneously.
exists e1 x1 x2 x3.(a_topic(x1) & across(e1,x3) & n_crosswalk(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(n_party(x2) & at(e1,x2) & Actor(e1,x1) & v_cry(e1) & n_people(x1))