A group of people are talking in a public area.
Someone is silent in a public area.
Being silent doesn't involve talking.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_area(x3) & a_public(s1) & Theme(s1,x3) & Actor(e1,x1) & v_talk(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists s1 s2 x1 x2.(in(s1,x2) & n_area(x2) & a_public(s2) & Theme(s2,x2) & Theme(s1,x1) & a_silent(s1) & n_person(x1))