An old man sits.
Grandpa sits in his rocking chair.
An old man is not necessarily Grandpa.
exists e1 s1 x1.(Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e2 e1 x1 x2.(n_chair(x2) & Actor(e2,x2) & v_rock(e2) & of(x2,x1) & n_male(x1) & ne_geo_grandpa(x1) & in(e1,x2) & Actor(e1,x1) & v_sit(e1))