A boy playing in a lake
The boy is wearing a life vest.
THE BOY MAY NOT BE AT A LAKE
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_lake(x3) & n_playing(x1) & of(x1,x2) & n_boy(x2))
exists e1 x1 x2 x3.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_vest(x2) & of(x2,x3) & n_life(x3))