A man waterskis while attached to a parachute.
A man water skiing with a parachute
waterskis is equivalent to  water skiing
exists s1 x1 x2 x3 x4.(a_topic(x1) & to(s1,x4) & n_parachute(x4) & Theme(s1,x3) & a_attach(s1) & (x1 = x3) & n_waterski(x1) & of(x1,x2) & n_man(x2))
exists x1 x2 x3 x4.(a_topic(x1) & with(x1,x4) & n_parachute(x4) & n_skiing(x1) & of(x1,x3) & n_water(x3) & of(x1,x2) & n_man(x2))