3 adults sitting in some sort of waiting area.
The adults are sitting down
" The adults are sitting " is a rephrasing of " 3 adults sitting "
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_area(x4) & Actor(e2,x4) & v_wait(e2) & n_sort(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_adult(x1) & n_date(x1) & a_date_day_03(x1) & a_date_day_03(x1))
exists e1 s1 x1.(n_adult(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))