a black and gray dog catches a tennis ball at the beach
A dog is playing with a man at the beach.
the dog is not always playing with a man
exists e1 s1 s2 x1 x2 x3 x4.(n_beach(x4) & at(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_ball(x2) & of(x2,x3) & n_tennis(x3) & n_dog(x1) & a_gray(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_beach(x3) & with(e1,x2) & at(x2,x3) & n_man(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))