a man jumps over a wave on his surfboard.
The man is riding a jet ski.
One cannot be using a surfboard and riding jet ski simultaneously
exists e1 x1 x2 x3.(over(e1,x2) & on(x2,x3) & n_surfboard(x3) & of(x3,x1) & n_male(x1) & n_wave(x2) & Actor(e1,x1) & v_jump(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_ski(x2) & of(x2,x3) & n_jet(x3))