A young child playing with a toy while laying on the floor.
A teenager is standing in the living room.
A teenager is not a young child.  One cannot be laying and standing simultaneously.
(x)
exists e1 x1 x2 x3.(n_room(x2) & of(x2,x3) & n_living(x3) & in(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_teenager(x1))