Two men are engaged in karate in an all white room.
two younger men are performing karate
Not all men are younger men. You can be engaged in an activity without performing.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_room(x3) & a_white(s1) & Theme(s1,x3) & in(e1,x2) & n_karate(x2) & Theme(e1,x1) & v_engage(e1) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_karate(x2) & n_man(x1) & r_more(s1) & a_younger(s1) & Theme(s1,x1) & card_eq_2(x1))