A man is riding in a boat on the water.
A man is going for a boat ride on the lake.
Not all water is a lake.
exists e1 x1 x2 x3.(n_water(x3) & in(e1,x2) & on(x2,x3) & n_boat(x2) & Actor(e1,x1) & v_ride(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_lake(x4) & for(e1,x2) & on(x2,x4) & n_ride(x2) & of(x2,x3) & n_boat(x3) & Actor(e1,x1) & v_go(e1) & n_man(x1))