LISTEN!
This link takes you to a an audio clip illustrating what spoken Indo-European may have sounded like. Here is a transcription:
h₂áu̯ei̯ h₁i̯osméi̯ h₂u̯l̥h₁náh₂ né h₁ést, só h₁éḱu̯oms derḱt. só gʷr̥hₓúm u̯óǵʰom u̯eǵʰed; só méǵh₂m̥ bʰórom; só dʰǵʰémonm̥ h₂ṓḱu bʰered. h₂óu̯is h₁ékʷoi̯bʰi̯os u̯eu̯ked: ’dʰǵʰémonm̥ spéḱi̯oh₂ h₁éḱu̯oms-kʷe h₂áǵeti, ḱḗr moi̯ agʰnutor’. h₁éḱu̯ōs tu u̯eu̯kond: ‘ḱludʰí, h₂ou̯ei̯! tód spéḱi̯omes, n̥sméi̯ agʰnutór ḱḗr: dʰǵʰémō, pótis, sē h₂áu̯i̯es h₂u̯l̥h₁náh₂ gʷʰérmom u̯éstrom u̯ept, h₂áu̯ibʰi̯os tu h₂u̯l̥h₁náh₂ né h₁esti’. tód ḱeḱluu̯ṓs h₂óu̯is h₂aǵróm bʰuged.
As you listen to it, read the script and pay attention to specific sounds, like the different varieties of velar fricatives, indicated by the letter h with the subscript numerals 1 and 2, as in the title: H2óu̯is h1éḱu̯ōs-kwe ('The Sheep and the Horse'). Listen to another sample audio about 'The King and the God' (*H₃rḗḱs dei̯wós-kwe). Here is a transcription:
H₃rḗḱs h₁est; só n̥putlós. H₃rḗḱs súhxnum u̯l̥nh₁to. Tósi̯o ǵʰéu̯torm̥ prēḱst: "Súhxnus moi̯ ǵn̥h₁i̯etōd!" Ǵʰéu̯tōr tom h₃rḗǵm̥ u̯eu̯ked: "h₁i̯áǵesu̯o dei̯u̯óm U̯érunom". Úpo h₃rḗḱs dei̯u̯óm U̯érunom sesole nú dei̯u̯óm h₁i̯aǵeto. "ḱludʰí moi̯, pter U̯erune!" Dei̯u̯ós U̯érunos diu̯és km̥tá gʷah₂t. "Kʷíd u̯ēlh₁si?" "Súhxnum u̯ēlh₁mi." "Tód h₁estu", u̯éu̯ked leu̯kós dei̯u̯ós U̯érunos. Nu h₃réḱs pótnih₂ súhxnum ǵeǵonh₁e.
There is an unbroken line of descent between early Indo-European and contemporary English; in other words, this is what "English" sounded like all those centuries ago.
For the curious:
Until 2019 the Finnish national radio broadcast a weekly news summary in classical Latin, another dead Indo-European language. It was a labor of love by Latin enthusiasts, and Finnish is not even an IE language! Sadly, it stopped broadcasting a while ago, but episodes are still available. More recently the Vatican Radio began its own news summary in Latin. Even a casual listener can detect a difference in pronunciation between the two: the Finnish broadcast reproduces classical pronunciation, while the Vatican uses an Italian, post-classical pronunciation.