A woman throwing a Frisbee on a beach.
A couple is playing catch with a Frisbee at the beach.
The woman is singular meaning one person not two which could possibly indicate a couple.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_beach(x4) & Theme(e1,x3) & Actor(e1,x2) & v_throw(e1) & n_frisbee(x3) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2 x3 x4.(n_beach(x4) & with(e1,x3) & at(x3,x4) & n_frisbee(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_catch(x2) & n_couple(x1))