A man plays a guitar while he sits on the grass.
The man is playing guitar outdoors.
He is not necessarily outdoors, he could be playing inside.
exists e1 p1 x1 x2 x3.(n_grass(x3) & exists e2.(on(e2,x3) & Actor(e2,x1) & v_sit(e2)) & n_male(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_outdoors(x2) & of(x2,x3) & n_guitar(x3))