A boy and a girl are swinging on a swing set in a park.
Brother and sister play outdoors.
The park is not necessarily outside and the boy and girl are not necessarily brother and sister
exists e1 e2 x1 x2 x3 x4 x5 x6.(on(e1,x4) & in(e2,x6) & n_park(x6) & Theme(e2,x5) & v_set(e2) & (x4 = x5) & n_swing(x4) & Actor(e1,x1) & v_swing(e1) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_boy(x2))
exists s1 s2 x1 x2 x3.(ne_nam_brother(x1) & a_topic(s1) & subset_of(x2,s1) & Time(x2,x3) & n_outdoors(x3) & n_play(x2) & a_sister(s2) & Theme(s2,x2) & subset_of(x1,s1))