"Это очень красивый замок."
Translation:This is a very beautiful castle.
I think "this is a pretty lock" should be correct also, right?
But there's no difference here if you don't have the speaker on.
But if you accept it, you have the problem that a translation is accepted which isn't right for the pronunciation... you can't win either way, I guess.
The idea is to take this course with audio, but you're right about the sentence being ambiguous without hearing it pronounced.
A suggested translation is "pretty". I find it difficult to find a castle "pretty". A chateau maybe. Unless of course it's Barbie's and mostly pink.