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Apr 13, 2017 at 12:55 history edited CommunityBot
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Mar 27, 2014 at 23:03 comment added StoneyB on hiatus You're getting into some possibilities here that you're unlikely ever to need. Both of those would be ambiguous. "To have done this" means that having done that (once) at any prior time will cheer him - but the deed may have already happened, may be happening now, or may happen at some time in the future before he reaches old age. To do this might mean either "Once he reaches old age, each time he does this he will become more cheerful" OR it might mean "Doing this (once) at any time in the future will cause him to be more cheerful throughout his (subsequent) old age".
Mar 27, 2014 at 22:20 comment added Nico Would there be any difference in meaning between "To have done this will make him more cheerful in his old age" and "To do this will make him more cheerful in his old age"? I guess that the answer depends on the context defining the Reference Time.
Mar 27, 2014 at 19:22 history answered StoneyB on hiatus CC BY-SA 3.0