Some young adults sip a yellow-green drink.
people sipping a drink
Adults are people and to sip is to drink.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sip(e1) & n_drink(x2) & a_yellow-green(s2) & Theme(s2,x2) & n_adult(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sip(e1) & n_drink(x3) & (x1 = x2) & n_people(x1))