A happy child is being pushed in a swing at the park.
The child is being pushed by its mother.
A child being pushed in a swing is not necessarily being pushed by the child's mother.
exists e1 s1 x1 x2 x3.(n_park(x3) & at(e1,x3) & in(e1,x2) & n_swing(x2) & Theme(e1,x1) & v_push(e1) & n_child(x1) & a_happy(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_mother(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & Actor(e1,x2) & Theme(e1,x1) & v_push(e1))