Children are reading and writing.
Children work at their school desks.
Children are reading and writing does not necessary that they at their school desks.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_write(x2) & n_child(x1))
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x3) & n_desk(x3) & of(x3,x4) & n_school(x4) & of(x3,x1) & n_thing(x1) & n_work(x1) & (x1 = x2) & ne_nam_children(x2))