A woodworker constructing a boat.
A human constructing.
A woodworker is a human, and constructing a boat is a form of 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 s1 x1.(a_topic(x1) & n_constructing(x1) & a_human(s1) & Theme(s1,x1))