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this post was submitted on 10 Sep 2024
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One of the major problems encountered in time travel is not that of becoming your own father or mother. There is no problem in becoming your own father or mother that a broad-minded and well-adjusted family can't cope with. There is no problem with changing the course of history—the course of history does not change because it all fits together like a jigsaw. All the important changes have happened before the things they were supposed to change and it all sorts itself out in the end.
The major problem is simply one of grammar, and the main work to consult in this matter is Dr. Dan Streetmentioner's Time Traveler's Handbook of 1001 Tense Formations. It will tell you, for instance, how to describe something that was about to happen to you in the past before you avoided it by time-jumping forward two days in order to avoid it. The event will be descibed differently according to whether you are talking about it from the standpoint of your own natural time, from a time in the further future, or a time in the further past and is futher complicated by the possibility of conducting conversations while you are actually traveling from one time to another with the intention of becoming your own mother or father.
Most readers get as far as the Future Semiconditionally Modified Subinverted Plagal Past Subjunctive Intentional before giving up; and in fact in later aditions of the book all pages beyond this point have been left blank to save on printing costs.
The Hitchhiker's Guide to the Galaxy skips lightly over this tangle of academic abstraction, pausing only to note that the term "Future Perfect" has been abandoned since it was discovered not to be.
This is the sort of thing that I love reading on the internet.
From a conlanger perspective I feel like the time reference could be split into four, to account time travel. For example: let's say that both of us travelled to 3100, I remained there and you came back to 2024. Then you write me a letter, that I'm going to read as soon as we arrive in 3100, telling me about your experiences. You could use:
Any given language could pick any of those references to model their tense around, or many of them, or even none (plenty languages IRL lack grammatical tense). If only doing things from the PoV of the speaker (you), that means 6~9 tenses for what most languages have 2 (past and non-past) or 3 (past, present, future).
Sorry to disappoint you, but most of that text is found offline — as it's an excerpt from Douglas Adam's "The Restaurant at the End of the Universe" (sequel to "The Hitchhiker's Guide to the Galaxy"). I probably should've attributed it.
And then you'd have to account who knows what, which version of a person you're talking to. Say you're having a conversation with someone before traveling in time to a time in which they've not timetraveled, so it's either their subjective past or future, but then you continue the conversation, so you'd have to account for both the speakers perspective and the person being spoken to, who would then be subject to two different tense "totalities" since the conversation with them would have been taking place in two different times at the same time.
I seriously suggest reading Douglas Adams and Terry Pratchett for that sort of thing. I used to use Pratchett books as a substitute for weed when I was a bit over twenty.