Two young children are standing in hall.
The children have their feet on the ground.
The phrase young children is indicative of particular age range where "children" could be of any age. "standing in hall." specifies being inside a building or structure of some form, where "feet on the ground" could also mean, "outside".
exists e1 s1 x1 x2.(in(e1,x2) & n_hall(x2) & Actor(e1,x1) & v_stand(e1) & n_child(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_ground(x3) & n_foot(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1))