However, over time, the weak verbs have become the normal form of verbs in all Germanic languages, with most strong verbs being reassigned to the weak class. For example, in Old English the verb "to lock" () was strong (present tense 'I lock', past tense 'I locked'), but has now become weak. This transition is ongoing. For example, the English verb "to cleave" currently exists in both a conservative strong form (past tense "I clove") and an innovative weak form (past tense "I cleaved").