weak verb

A Weak Verb adds d, ed, or t, to the Present Tense, to make the Past Tense; as, invite, invited; betray, betrayed; step, stept.

Three basic root consonant classes exist: the strong verb, roots with weak initial root consonant (I-weak verbs), roots with weak final consonants (III-weak verbs), and a composite class...

Storage clearly is assumed for irregular verb forms. But what about regular or weak verb forms?