There is a man surfing at night.
A woman surfs at a sunny beach.
A man isn't a woman.
exists p1 x1 x2 x3 x4.((x1 = x2) & at(x2,x4) & n_night(x4) & n_surfing(x2) & of(x2,x3) & n_man(x3))
exists e1 s1 x1 x2.(at(e1,x2) & n_beach(x2) & a_sunny(s1) & Theme(s1,x2) & Actor(e1,x1) & v_surf(e1) & n_woman(x1))