Teenagers are interacting with elderly people in a common room.
Nobody is talking.
If nobody is talking then the teenagers are not interacting.
exists e1 s1 s2 x1 x2 x3.(in(e1,x3) & n_room(x3) & a_common(s2) & Theme(s2,x3) & with(e1,x2) & n_people(x2) & a_elderly(s1) & Theme(s1,x2) & Actor(e1,x1) & v_interact(e1) & n_teenager(x1))
-exists e1 x1.(Actor(e1,x1) & v_talk(e1) & n_person(x1))