Children are reading and writing.
The children are playing volleyball.
Reading is not the same as playing.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_write(x2) & n_child(x1))
exists e1 x1 x2.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_volleyball(x2))