A young man is lining up on the scrimmage line in football practice.
a young man is sitting in the locker room.
Lining up means standing not sitting.  The scrimmage line is not in the locker room.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_line(x2) & of(x2,x3) & n_scrimmage(x3) & a_up(s2) & Manner(e1,s2) & on(e1,x2) & in(x2,x4) & n_practice(x4) & of(x4,x5) & n_football(x5) & Actor(e1,x1) & v_line(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_room(x2) & of(x2,x3) & n_locker(x3) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))