Those could all be used. A, B and C express more certainty than D and E.
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seagullIs "Frank can [could] have arrived at the airport by now" also possible?"could" is possible (similar level of certainty to "may/might").
GPY seagullIs "Frank can [could] have arrived at the airport by now" also possible?"could" is possible (similar level of certainty to "may/might")."can" does not work there.Frank could have arrived at the airport by now.
fivejedjonModal verbs can each convey a very wide range of meaningsThank you for the reply.