A child having dental work done.
A child is at the dentist for a cavity.
Not all dental work is for a cavity, and not everyone has a cavity.
exists e1 e2 s1 x1 x2 x3.(Theme(e2,x1) & v_do(e2) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_work(x3) & a_dental(s1) & Theme(s1,x3) & (x1 = x2) & n_child(x1))
exists p1 x1 x2.(n_dentist(x2) & exists x3.(at(x1,x2) & for(x2,x3) & n_cavity(x3)) & n_child(x1))