People eating at a chinese restaurant.
There was no one eating at the Chinese restaurant.
If people are eating at the restaurant, then you can't say that no one is.
exists e1 s1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_restaurant(x3) & a_chinese(s1) & Theme(s1,x3) & Actor(e1,x2) & v_eat(e1) & (x1 = x2) & n_people(x1))
exists p1 s1 x1 x2.(n_restaurant(x2) & a_chinese(s1) & Theme(s1,x2) & at(p1,x2) & -exists x3.((x1 = x3) & n_eating(x3) & card_eq_1(x3)))