7.9 - Auxiliary verbs
There are some instances where the usage of an auxiliary verb is required by rules of syntax.
Such auxiliaries inflect for the tense cathegory (see Paragraph 7.1) in agreement with the main verb of the clause, but are invariable as to the aspect/mood cathegory and the subject agreement. They all have an -a suffix which is attached to the ending of the impersonal.
Among the most common auxiliaries are found: to do, to make, to act, to be. Here are their respective (irregular) paradigms:
The choice of the auxiliary verb is purely a matter of style. The auxiliary, in fact, is, so to speak, devoid of any lexical meaning.