A young child walks on the grass away from a stone monument.
The child is sleeping.
Assuming that the child is not sleepwalking, then a person can not be walking and sleeping at the same time.
exists e1 s1 x1 x2 x3 x4.(n_grass(x2) & from(e1,x3) & n_monument(x3) & of(x3,x4) & n_stone(x4) & r_away(e1) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(n_child(x1) & Actor(e1,x1) & v_sleep(e1))