A man sits on a non-moving motorcycle
A man is on a moving motorcycle.
Something can't be non-moving and moving.
exists e1 s1 x1 x2.(on(e1,x2) & n_motorcycle(x2) & a_non-moving(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists p1 x1.(exists e1 x2.(on(x1,x2) & n_motorcycle(x2) & Actor(e1,x2) & v_move(e1)) & n_man(x1))