In English, there are verbs that have two valid past participles. An example for such a verb would be sow which has the two forms sowed and sown.
Are there English verbs that have more than one valid past tenses?
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While the trend seems to be towards the regularization of verbs, some have gone the other way:
More recently, in some American dialects, we now have snuck (for sneaked) and dove (for dived). Personally, they make me shudder.