Can I use perfect infinitive for future plans?

For instance: It will be fun to have travelled with you during next week.

Is it grammatically correct?

  • It's "grammatical", but what good does knowing that do you? There are almost no circumstances in which a native speaker would find it idiomatically acceptable. In fact, it's such a weird thing to say that even if you could contrive a context where you really did want the exact meanings implied by the choice of tenses, you would never use those words to express yourself. Commented Sep 16, 2016 at 0:46
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    @FumbleFingers Would it be appropriate in a situation where a character has an inner monologue about his recently deceased relative, whilst strapping himself to a time machine and planning to undo his wrongdoings? "you would never use those words(...)" is "during" the problem here, could you elaborate?
    – Jakub
    Commented Sep 16, 2016 at 1:32
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    @P.E Dant I think this question is not a duplicate, I am specifically asking about perfect infinitive with reference to "future". Thanks
    – user40875
    Commented Sep 16, 2016 at 9:33
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    I agree with @Amn The supposed duplicated question does not mention the use of the perfect infinitive to refer to future time. Commented Sep 16, 2016 at 11:01
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    @Amn: But I assume you understand the basic meaning of "perfect" verb forms, so you can see the difference between your perfect infinitive to have traveled and the simple infinitive to travel. Your example is saying that to be in the state of having traveled will be fun, whereas the more normal simple infinitive says the actual act of traveling will be fun, which would nearly always be what you meant. Both meanings can be grammatically expressed (as I said, your example is "valid"), but why would you speak about the fun of having done something rather than the fun of doing it? Commented Sep 16, 2016 at 13:44