The document discusses the future perfect tense in Latin grammar. It explains that the future perfect tense describes an action in the future that will be completed, with emphasis on the resulting state rather than the action itself. As such, it acts like a past tense for the future. The future perfect conjugations are then provided for the first, second, and third person singular and plural forms.

1. Future Perfect
This vision of the future is one that is complete. The action will take
place in the future, but there is a strong feeling that it will be
completed almost immediately. There is also a stronger emphasis
on the state of things after the completion of the action, rather than
the doing of the action itself.
It therefore acts as something like “the past of the future”.

2. Endings: Future Perfect Active Indicative
Those are just the future forms of sum!
Add these to the perfect stem. all classes
1st
Person
Singular (I) ~erō
Plural (we) ~eritis
2nd
Person
Singular (you) ~eris
Plural (you all) ~eritis
3rd
Person
Singular (he|she|it)
~erit
Plural (they) ~erint