A child on a plastic sled.
The child is sleeping in a bed.
A child can be either on a sled or in a bed, but not both simultaneously.
exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & Theme(e1,x3) & v_sled(e1) & (x2 = x3) & n_plastic(x2) & n_child(x1))
exists e1 x1 x2.(n_child(x1) & in(e1,x2) & n_bed(x2) & Actor(e1,x1) & v_sleep(e1))