Questions & Answers about آن کتاب قدیمی ولی جالب است.
The sentence uses vali for 'but'. Can I use ammâ instead here?
Yes, vali and ammâ both mean 'but' and can be used interchangeably here. vali is slightly more common in everyday spoken Farsi, while ammâ can sound just a tiny bit more formal. Both are perfectly fine to connect ghadimi (old) and jâleb (interesting).
I learned another word for 'old'. Why do we use ghadimi for this book?
In Farsi, we use different words for 'old' depending on what we are describing. ghadimi is used for objects, places, or concepts, like this book. If you want to say a person or an animal is old, you have to use the word pir instead.
Why isn't it ketâb-e ghadimi with the connecting 'e' sound?
You only use that connecting 'e' (called the ezafe) when the adjective is attached directly to the noun, like if you wanted to say 'That old book' (ân ketâb-e ghadimi). Because this sentence says 'That book IS old', the adjective stands alone as the description later in the sentence, so no 'e' connector is needed.
The English translation says 'That book is...', so why does the Farsi verb ast (is) come at the very end?
Farsi sentences almost always put the verb at the very end. While English says 'Subject + is + Description', Farsi uses 'Subject + Description + is'. That is why ast waits until after the whole descriptive phrase ghadimi vali jâleb is finished.