The children are sitting with their shoes off.
There are people sitting.
In a both sentence, people are sitting.
exists e1 s1 x1 x2.(n_shoe(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & a_off(s1) & Manner(e1,s1) & with(e1,x2) & Actor(e1,x1) & v_sit(e1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_people(x2))