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I've just started studying Wheelock. In the Vocabula section, the entry for amo is amo, amare, amavi, amatum. Yet most dictionaries give the past participle as amatus. Which is correct?

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Both are correct. The perfect participle has several forms for different genders, numbers, and cases. An entry in a dictionary does not give all the forms of a word, not even all the forms of any participle of a verb, but enough hints that allow you to figure out all the forms. For the perfect passive participle the typical choice is to list the singular nominative in either masculine or neuter. The plural feminine accusative amatas would serve the purpose just as well, so this is more a matter of tradition than of logic.

See also:

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In the context of vocabulary lists, amatum can be interpreted as the neuter of the perfect passive participle (as per Allen and Greenough), but it can alternatively be interpreted as the accusative supine form. Supines are more rarely used in general than perfect passive participles, but some verbs that lack passive forms have a supine. They have the same stem, and the stem is the important part when giving a principal part of a verb: it doesn't make a difference what the ending is because you have to take that off anyway to form other forms of the verb.

Sometimes the future active participle is listed instead: this is a third form built on the same stem.

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    The future participle builds on the stem of the perfect participle often but not always. It's useful to give both forms in a vocabulary, especially when there's a stem surprise.
    – Joonas Ilmavirta
    Commented May 3, 2023 at 4:30

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