New answers tagged past-participle
Let's check our trusted friend Duden: GRAMMATIK starkes Verb; Perfektbildung mit »hat« Which makes you 100% correct and the others wrong - as far as Standard German is concerned. Note that there are many regional deviations that are against the "official" rules, from auxillary verbs to particles. I suggest you stick to the "standard" because you ...
According to Martin Durrell Using German, bin ... angefangen is a North German variation while in standard German one needs to use haben. See page 232 of this book.
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