The lady is pushing a child in a stroller.
Lady is chasing a cat
If the lady is chasing a cat, she cannot be pushing a stroller.
exists e1 x1 x2 x3.(n_lady(x1) & in(e1,x3) & n_stroller(x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_child(x2))
exists e1 x1 x2.(ne_nam_lady(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_cat(x2))