French sentence structure "N faire de N N" is shown to present a three-way ambiguity, according to the use of the verb "faire": ordinary transitive and support (or light) "faire" constitute a transitive structure, but the third one, "causative operator faire" , makes a peculiar one in which a direct nominal (N) functions, not as a direct object, but as a indirect object ("de N") complement. As an operator, the verb takes as "operand" a particular type of copular sentence, i.e. identificational type, on the contrary to "rendre" and "mettre", well-known causative verbs, applied only to predicational type. "faire", "rendre" and "mettre" are in complementary distribution. Different possibilities of causative operators for different types of copular sentences are also discussed.