Two girls sitting in brown chairs with beverages on the table.
The girls are sitting.
Two girls are plural and are sitting is an activity done in chairs.
exists e1 s1 x1 x2 x3 x4 x5.(n_table(x5) & a_topic(x1) & on(e1,x5) & with(e1,x4) & n_beverage(x4) & in(e1,x3) & n_chair(x3) & a_brown(s1) & Theme(s1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1.(n_girl(x1) & Actor(e1,x1) & v_sit(e1))