A young boy wearing an orange shirt is playing on big rocks.
A boy swims in the river
One cannot be playing on rocks and swimming at the same time.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(on(e2,x5) & n_rock(x5) & a_big(s2) & Theme(s2,x5) & Actor(e2,x1) & v_play(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_shirt(x3) & of(x3,x4) & n_orange(x4) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_river(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_boy(x1))