The field is fenced in.
the fence around the field keeps people out
Not all fences around a field are inteded to keep people out. Some might be for keeping animals from getting out.
exists e1 s1 x1.(n_field(x1) & a_in(s1) & Manner(e1,s1) & Theme(e1,x1) & v_fence(e1))
exists e1 s1 x1 x2 x3.(n_field(x2) & n_fence(x1) & a_out(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_keep(e1) & n_people(x3) & around(x1,x2))