Two children play outside in a field.
Two children are reading at their desks.
The children cannot be playing outside and reading at their desks simultaneously.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & r_outside(e1) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_2(x1))
exists e1 x1 x2.(at(e1,x2) & n_desk(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_read(e1) & n_child(x1) & card_eq_2(x1))