I have come across the Passive Perfect Infinitive and my current textbook represents it as a nomative participle + esse (e.g. salutatus esse). However on the internet I mostly see it represented as an accusative participle + esse.
As far as I know you can theoretically use the passive perfect infinitive with every participle form although most will feel awkward and be very rare.
The most common form I have encountered is a participle accusative + esse which is generally translated as an Accusativus cum infinitvo although I realise Nominative cum infinitivo's also exist.
So now my question is, how should it be represented in a textbook? Wikitionary gives the accusative, my own textbook give it as a nominative. It would most commonly appear as an accusative but obviously in it's 'original form' it would appear as a nominative.
So if I were to write a textbook, how should I show it as? Nominative because it is the original, or the accusative because it is the most common?