1 Ā used in a
Ps sense (esp. Pf)
3 only 3/sg
This is the most important conjugation system.
Pr/Ind/Imp/Opt and Impf/Ind are not all formed in the same way from the √,
but there is a pattern when the √ are classified. There are 10 such √-classes.
Classes I, IV, VI and X are conjugated in the same manner after the S has been formed according to the different rules of each class. This conjugation is called the thematic conjugation (Th)
The other classes (II, III, V, VII, VIII and IX) all have their own S-formation and conjugation. These conjugations are collectivly called athematic conjugation (ATh)
The notion of a √-class do not apply to Ps or Fu, since they can each be described with rules for all √.
Ao has its
own classification of √.
Pf is conjugated differently depending on the form
of the √.