A person attached to a harness is being dragged through the water.
A person standing in the sand on the beach.
A person who is standing is not being dragged. Sand is not water.
exists e2 e1 x1 x2 x3 x4.(n_water(x4) & through(e2,x4) & Theme(e2,x1) & v_drag(e2) & to(e1,x3) & n_harness(x3) & Theme(e1,x2) & v_attach(e1) & (x1 = x2) & n_person(x1))
exists x1 x2 x3 x4.(n_beach(x4) & n_sand(x3) & a_topic(x1) & on(x1,x4) & in(x1,x3) & n_standing(x1) & of(x1,x2) & n_person(x2))