How far back in time would I have to go before the English language (UK) is completely unrecognisable?
How far back in time could someone who speaks english travel and have their accent/vocab be seen as normal?
How far back in time could you go, before modern English becomes unintelligible to inhabitants of the British Isles?
I am a native English speaker with a hypothetical time machine. How far back in time in England can I go and still communicate intelligibly with the locals?
As an English speaker, how far back in time could I go before I could no longer understand English?
How far back in time would we have to go to not understand "English" in a conversation?
Language specific: let's say I can time travel, how far back in time would I have to go to meet someone in the same area (geographically) that cannot understand me?
If I am speaking English and had access to a time machine, how far back in time could I go and still hold a coherent conversation with another of my countrymen?
How far back in time could an English speaking person go, and still be understood.
How far back in time would I have to travel before I would be unable to communicate with fellow English speakers?
How far back in time can I go and still be able to communicate with English speakers relatively easy?
And so forth.
As always more can be said but u/Bayoris has a great answer here: https://www.reddit.com/r/AskHistorians/comments/8moelw/how_far_back_in_time_could_you_go_before_modern/dzpb446?utm_medium=android_app&utm_source=share