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 in Yorshaan, in 1843.

Silimar to strong conjugation in Germanic languages, the apophony exists in G-verbs. There are three principle parts to memorize: present, past, and future tense. The three subcategories of strong verb are sometimes called I-A verb, I-U verb, and I-Œ verb. (or A-verb, U-verb, and Œ-verb) Which category should a strong verb be in depends on the last vowel of the present tense principle.

The conjugation of strong verb is quite complex. Verbs formed by doubling its last vowel of the stem and adding an infix -ss- between the doubled vowels (in order to express negation) should change the doubled vowels at the same time. That is, the word "bœssœzeem" (be unable to do) has to change both "œ" of the stem. In other words, made bœssœzeg (it is unable to be dealed with.) → made bossozeg (it was unable to be dealed with.).

For all G verbs, its gerund is PST+auu.

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.