COULD HAVE BEEN CONFUSION
MAY HAVE BEEN, MIGHT HAVE BEEN, MUST HAVE BEEN, WOULD HAVE BEEN, WILL HAVE BEEN
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have lived と have been livingの違い。
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English Modals+Have been : Would Have Been, Should Have Been, Could Have Been, Can/May+Have Been
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MIGHT BE/ MIGHT HAVE BEEN/MAY BE/MAY HAVE BEEN
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