A smiling boy floats in a pool.
A child left alone is drowning.
If a boy is floating then the child is not drowning.
exists e1 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_pool(x3) & n_float(x1) & of(x1,x2) & n_boy(x2) & Actor(e1,x1) & v_smile(e1))
exists e1 e2 p1 x1 x2.(Actor(e2,x1) & v_drown(e2) & exists s1.(Theme(s1,x2) & a_alone(s1)) & Recipient(e1,p1) & Topic(e1,x2) & v_leave(e1) & (x1 = x2) & n_child(x1))