The Amish group is standing by the fence.
An Amish group is constructing a barn.
If you are standing you probably are not doing anything in particular, if you are constructing then you are busy building something.
exists e1 s1 x1 x2.(n_fence(x2) & n_group(x1) & a_amish(s1) & Theme(s1,x1) & by(e1,x2) & Actor(e1,x1) & v_stand(e1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_construct(e1) & n_barn(x2) & n_group(x1) & a_amish(s1) & Theme(s1,x1))