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are divided into strong, weak and preterito-presentic verbs, depending on the relation between the present and past tense forms.
The strong verbs form their past tense stem by changing the stem vowel (ablaut) and the weak verbs form their past tense stem by adding a suffix. The preterito-presentic do the same, but use past tense forms for the present tense.
Strong verbs are divided into seven classes, depending on how they change their stem vowels in the different tenses. In the first class it changes from an /í/ in the present to an /ei/ in the preterite, in the 2nd from /jó/, /jú/ or /ú/ into /au/ etc. The endings of the different tenses are always the same though.
The present participles of all verbs end with -andi, and are inflected with the weak endings of adjectives in the comparative grade.
The perfect participles of weak verbs are all inflected like ordinary adjectives. The perfect participle of strong verbs are inflected like adjectives ending with -inn.
© Peter Pettersson