If you walk outside your door and look up you'll see that the sky is what's up. It made me put more than "the sky." But there ya go. That is what's up.
Do it for me I you mean it to you mean I don't know what
<u>The fourth principal part, as the perfect passive participle, is an adjective. Usually just the masculine nominative singular is given. The complete forms are: -us, -a, -um.
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<u>N.B.: intransitive verbs do not have a regular 4th principal part (because they can’t be made passive); this includes the verbs that take a dative (noceō, pāreō, etc.)
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<u> Some are listed as –tum/-sum, which is the supine.
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<u> Some have forms in -tūrus/-sūrus (e.g. sum – futūrus; veniō – ventūrus; fugiō – fugitūrus), which is the future active participle
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<u> Some have no fourth form: (e.g. timeō – –; noceō —)
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