A boy writes on the ground using white chalk.
A boy is sleeping.
one cannot be sleeping an write.
exists e1 e2 s1 x1 x2 x3.(n_ground(x2) & for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_use(e2) & n_chalk(x3) & a_white(s1) & Theme(s1,x3) & on(e1,x2) & Actor(e1,x1) & v_write(e1) & n_boy(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_boy(x1))