A man with white hair is drinking.
A white hair is sipping a drink.
Drinking slowly is described as sipping a drink.
exists p1 s1 x1 x2.(exists x3.((x1 = x3) & n_drinking(x3)) & with(x1,x2) & n_hair(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sip(e1) & n_drink(x2) & n_hair(x1) & a_white(s1) & Theme(s1,x1))