A boy is playing on a green swing in front of a wooden barn.
there is a boy who is riding his blue bike on a dirt road
The boy is either on a swing or on a bike, but cannot be both.
exists e1 s1 s2 x1 x2 x3 x4.(in(e1,x3) & of(x3,x4) & n_barn(x4) & a_wooden(s2) & Theme(s2,x4) & n_front(x3) & on(e1,x2) & n_swing(x2) & a_green(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
exists p1 x1 e1 s1 x2 x3 x4 x5 x6.((x1 = x2) & on(e1,x5) & n_road(x5) & of(x5,x6) & n_dirt(x6) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & a_blue(s1) & Theme(s1,x4) & of(x4,x2) & n_male(x2) & (x2 = x3) & n_boy(x2))