The man is being pulled behind a boat and doing tricks.
A man is water skiing.
It is not known if the man is water skiing.
exists e2 e1 x1 x2 x3.(n_man(x1) & Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & n_trick(x3) & behind(e1,x2) & n_boat(x2) & Theme(e1,x1) & v_pull(e1))
exists p1 x1.(exists x2 x3.((x1 = x2) & n_skiing(x2) & of(x2,x3) & n_water(x3)) & n_man(x1))