It seems to me that it's employed largely in concerns or embedded questions (like the instance with "whether"), or in distinction with One more verb phrase in a more usual tense.
The geese obtained with each other in a tight team, caught their heads together and questioned: “ Who can have done this? Who may have completed this?”
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Except the few which have owed their rise to trade, Imagine no matter if amongst Those people households which we behold seated on the summit of that eminence which happens to be composed of power, opulence, and factitious dignity, there can are already any who have been lifted by something superior depredation: accredited and irresistible depredation; depredation by that swarm of harpies...
So when Alison Carter went missing in December 1963, it intended more to me and my classmates than it may have done to most Others.
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At the chance of indicating some thing silly, I won't try and respond to the issue myself. I recognize that all three synchronically roughly equal and substitutable, but It might be rather good to be aware of the standard usage notes to the abbreviations.
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Wanting in the Google Books outcomes for examples, a great deal of the 1st samples of perfect "can happen to be"s had been from grammar publications, but I did uncover the subsequent samples of use "in the wild" so to speak:
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The "can + pefect infinitive" design would not appear to be unachievable, just very unusual (possibly for semantic motives, as Janus Bahs Jacquet claims). I did a wildcard research about the Google Ngram Viewer to have an concept of the most typical sequences of "may have" + verb; it gave, from most to minimum Regular, the next constructions using a previous participle: can have already been, may have had, can have carried out, can have offered, can have taken, can have unsuccessful, might have transpired, might have designed, can became.
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As Tushar Raj details out, there are actually other buildings that glance the exact same, but have unique grammar.
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I am asking with regard to the conventions of abbreviations of internet pages, for educational/journal reasons. For instance, if one submits a paper on arXiv, you will note that some renown physicist/mathematician employs the conventions of:
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