The park bench is mounted into the ground.
The bench has been stolen before
Just because the bench is mounted into the ground doesn't mean it has been stolen before.
exists e1 x1 x2 x3.(n_ground(x3) & n_bench(x1) & of(x1,x2) & n_park(x2) & into(e1,x3) & Theme(e1,x1) & v_mount(e1))
exists e1 s1 x1.(n_bench(x1) & a_before(s1) & Manner(e1,s1) & Theme(e1,x1) & v_steal(e1))