a brown labradoodle retrieves a tennis ball in a lake
Child throws tennis ball into lake for brown dog to fetch
A dog retrieving a ball from a lake can be done for a variety of purposes beyond fetch and the ball could have gotten there from many more ways than simply a 'child throws.
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_lake(x4) & Theme(e1,x2) & Actor(e1,x1) & v_retrieve(e1) & n_ball(x2) & of(x2,x3) & n_tennis(x3) & n_labradoodle(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 p1 s1 x1 x2 x3 x4 x5 x6.(Topic(e1,p1) & exists e2.(Actor(e2,x1) & v_fetch(e2)) & into(e1,x5) & for(x5,x6) & n_dog(x6) & a_brown(s1) & Theme(s1,x6) & n_lake(x5) & Theme(e1,x3) & Actor(e1,x2) & v_throw(e1) & n_ball(x3) & of(x3,x4) & n_tennis(x4) & n_child(x2) & n_child(x1))