The boy is going to dive in the river.
A boy near a river.
You can dive in a river.
exists e1 x1 x2 x3.(n_river(x3) & n_boy(x1) & in(e1,x3) & to(e1,x2) & n_dive(x2) & Actor(e1,x1) & v_go(e1))
exists x1 x2.(a_topic(x1) & near(x1,x2) & n_river(x2) & n_boy(x1))