Ask to identify head, argument, adjunct. head. The single word that determines meaning and properties of the whole. I persuaded Geena of the value of pigs' having wings. I persuaded Geena. I persuaded that pigs have wings.
Pigs have wings.
Of pigs have wings. Of pigs' having wings. Then assign adjunct, argument, etc., accordingly. Wags say Chomsky's greatest invention was the asterisk denoting improper grammar. Poetry and degrees of grammaticality.