Learn Farsi: آیا کسی از این دکون بادوم خرید؟

This sentence uses colloquial Tehrani pronunciation, where the 'ā' sound changes to an 'u' sound when it comes right before an 'n' or 'm'. Because informal written Farsi often reflects spoken Farsi, you will frequently see dokān written as دکون (dokun) and bādām as بادوم (bādum).

Isn't āyā a formal word? Why is it used here with casual words like dokun?

Yes, āyā is typically formal, while dokun and bādum are highly colloquial. In everyday speech, Iranians usually just use a rising tone of voice to ask a question. Seeing them mixed like this can happen in text messages or casual internet comments where a writer wants to clearly flag a question but still uses relaxed, spoken spellings for the nouns.

Does the subject kasi (anyone) always take a singular verb like kharid?

Yes. Just like in English, indefinite pronouns like kasi (someone/anyone) and hichkas (no one) are treated as singular in Farsi, so they take the third-person singular verb ending. Here, kharid is the simple past third-person singular of the verb kharidan (to buy).

What is the difference between dokun and maghāze for a shop?

Maghāze is the standard, everyday word for a modern store. (or the formal ) has a more traditional or old-fashioned feeling, much like referring to a small, older mom-and-pop shop.