A man practicing boxing
A person is fighting with another in practice
Practicing boxing does not always involve fighting with another person.
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_box(e1) & (x1 = x3) & n_practicing(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2 x3.(in(e1,x3) & n_practice(x3) & with(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_fight(e1) & n_person(x1))