A woodworker constructing a boat.
Nobody is construcing
The woodworker can't be constructing a boat if nobody is constructing.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_construct(e1) & n_boat(x3) & (x1 = x2) & n_woodworker(x1))
-exists e1 x1.(Actor(e1,x1) & v_construce(e1) & n_person(x1))