But the fact that some languages make the actualisation of the predicate a definite function, does not imply that actualisation is, in principle, more than one aspect of the basic linguistic process according to which communication can be made more specific by means of additional elements. A distinction may be made between optional specification and compulsory addition, as a subject, for which the term ‘actualization’ could by convention be reserved. But it should be kept in mind that a compulsory subject does not really actualize a predicate more than an optional complement would.
- Martinet (1962), Pag. 61-62