A dancer poses in an empty room.
A dancer practices poses alone.
In an empty room means you are alone.
exists e1 s1 x1 x2.(in(e1,x2) & n_room(x2) & a_empty(s1) & Theme(s1,x2) & Actor(e1,x1) & v_pose(e1) & n_dancer(x1))
exists e1 s1 x1 x2.(a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_pose(e1) & n_practice(x1) & of(x1,x2) & n_dancer(x2))