A man is riding a lawn mower on the street.
A guy is playing frisbee at the park.
One cannot be riding a lawn mower at the same time he is playing frisbee in the park.
exists e1 x1 x2 x3 x4.(n_street(x4) & on(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_mower(x2) & of(x2,x3) & n_lawn(x3) & n_man(x1))
exists e1 x1 x2 x3.(n_park(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_frisbee(x2) & n_guy(x1))