Kids riding the subway
kids are in a truck
Kids cannot be riding the subway and be in a truck at the same time.
exists e1 x1 x2 x3.(n_subway(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & (x1 = x2) & n_kid(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_truck(x2)) & n_kid(x1))