Reegis Are all of them correct and mean the same? Yes. Of the four, (2) is probably used most, then (4).
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ReegisAre all of them correct and mean the same?Yes. Of the four, (2) is probably used most, then (4). (1) isn't used much; it sounds a little off to my ear as a "maybe" statement.
ReegisAnd now you kind of confirmed that 1) is different than the othersRight. To show "It is possible that ...", we use "might", "may" (less often), or (even less often) "could". "can" is not as appropriate as its core meaning is "to be able, physically able, mentally able, morally capable, etc."
ReegisI am wondering if I am not ove