An old man looks at people shopping.
An old man is watching people shop.
Looks and watching are synonyms.
exists e1 s1 x1 x2.(r_shopping(e1) & at(e1,x2) & n_people(x2) & Actor(e1,x1) & v_look(e1) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 p1 s1 x1 x2.(for(p1,e1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_people(x2) & exists x3.((x1 = x3) & n_shop(x3)) & n_man(x1) & a_old(s1) & Theme(s1,x1))