Man wearing black is windsurfing.
there is a man windsurfing
A man windsurfing is doing just that.
exists e1 s1 x1 x2 x3.(Actor(e1,x1) & v_windsurf(e1) & Theme(s1,x3) & a_black(s1) & (x1 = x3) & n_wear(x1) & of(x1,x2) & n_man(x2))
exists p1 x1 x2 x3.((x1 = x2) & n_windsurfing(x2) & of(x2,x3) & n_man(x3))