A small boy is playing with rocks
The boy is reading a book
The boy can't play with rocks while reading a book.
exists e1 s1 x1 x2.(with(e1,x2) & n_rock(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2))