Category talk:Dutch non-standard strong verbs
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Quite a few of these like helpen, werven etc. are really a subgroup in class 3. Certainly historically. en.wikipedia calls them class 3b I believe.
E.g. they all have short vowel + liquid (helpen, werven)
Middle Dutch still had the typical class 3 sequence: helpen-halp-holpen-geholpen with the ancient vowel difference between singular and plural past tense. Probably under influence of the class 7 verbs these two vowels of preterit were replaced by 'ie' instead of the more usual "o" that the rest of the class defaulted to.