A child swims with a woman.
People flying on an airplane.
The people that swims could not have been flying a plane same time.
exists e1 x1 x2.(with(e1,x2) & n_woman(x2) & Actor(e1,x1) & v_swim(e1) & n_child(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_airplane(x3) & Actor(e1,x2) & v_fly(e1) & (x1 = x2) & n_people(x1))