Yorshaan/Regular Verb

Most verbs in Yorshaan are regular. Generally speaking, there are three categories of the regular verbs:I, II, and III verb.

G-Verb (I)
G stands for Gertiys, which means "strong" in Yorshaan, and G-Verb is litarally "Strong verb". Such idea was introduced by Ernst Lornis, a German linguist who researches Yorshaan, in 1843.

Silimar to strong conjugation in Germanic languages, the apophony exists in G-verbs. There are totally three kinds of alternation, depending on the second to the last vowel (as for its infinite form). The three kinds of strong verb is sometimes called I-A verb, I-U verb, and I-Œ verb. (or A-verb, U-verb, and Œ-verb) Verbs who is formed by doubling its penult vowel and adding an infix -ss- (in order to express negation) such as bœssœzeem (be unable to do) have to change both "œ" of the stem. That is: made bœssœzeg (it is unable to be dealed with.) → made bossozeg (it was unable to be dealed with.).
 * In the case of a, the alternation is a-e-æ. (Present-Past-Future)
 * In the case of u, it's u-i-ai.
 * In the case of œ, it's œ-o-ie.

M-Verb (II)
M refers to Mimiys, which means "small" in Yorshaan, in contrast to Gertiys. No vowels should be replaced or change in M-verbs. Such verbs are sometimes be called "weak verb", corresponding to G-verb, strong verb.

D-Verb (III)
D represents Doriys, which means Stillness in Yorshaan, in contrast to strong and weak verbs. D-verbs are less variable, and can be regarded as simplified verbs. The first and second person are merged.

D-verbs can be categoried into two subtypes: III-E and III-O, depending on the last vowel of the verbs in indicative mood, though their infinite form have the same ending -us.