There are two types of past participle based on the distinction between strong and weak verbs. A strong verb can form a past participle, which declines as either a strong or weak adjective; likewise a weak verb's past participle may take either weak or strong adjectival endings.

These verbs are actually adjectives that express a state of being resulting in a past action (English verbs ending with -en/-ed). Strong Wistra Gutisk verbs follow the ablaut of the verb Class system, while the weak verbs follow the thematic verb+dental formation.

Strong Verb Past Participle

(or English participles ending in -en)

Strong verbs form the past participle by adding the suffix -an to the verbal stem, then adding strong a-stem or weak adjective endings to the -an suffix. The chart below shows the formation of strong verbs with a weak and strong declension of the nominative singular.

Weak Verb Past Participle

(or English participles ending in -ed)

Weak verbs form the past participle by adding a dental suffix -þ (English ask-ed). -þ is added to the stem, usually with a thematic vowel (thV), and adjective endings are then added to this. The vowel depends on weak verb class. Even though there are no records that the Class IV verbs had any forms, the logical possibility would be that of -no affixed with -þ, plus any a-stem, or weak adjectival ending that is needed.