Weak and Strong
Weak verbs should be contrasted with strong verbs, which form their past tenses by means of ablaut (vowel gradation: sing - sang - sung). Most verbs in the early stages of the Germanic languages were strong. However, as the ablaut system is no longer productive except in rare cases of analogy, almost all new verbs in Germanic languages are weak, and the majority of the original strong verbs have become weak by analogy.
Read more about this topic: Germanic Weak Verb
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