When i build this sentence from a selection of words and selected "o", it said "velké o" but why? Is it just what the synthesized voice made or is there something more to it than that?
Weird audio bug. Don't think we can do anything about that, sorry!
Why is "Vy četl jste..." instead of "Vy jste četl..." not also correct here?
The second position rule for jste as a past auxiliary.
Is it possible to say "přečetl jsi tu polskou knihu o češích?" ?
VladaFu, could you also say: "četl jsi tu polskou knihu o češích?" ?
This is even better. I am a native speaker and the suggested word position (by Duolingo) is not ideal. It should be "Četl jste (vy) tu knihu?
What's wrong with tu... Jsi četl?
Yes, that should be possible.