A crowd of people are socializing.
People are sitting silently.
People cannot be socializing if they are sitting silently.
exists e1 x1 x2.(Actor(e1,x1) & v_socialize(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_silently(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_people(x1))