Learn Farsi: اگر هم‌سلیقه بودیم، این پیراهن را می‌خریدیم. - If we had the same taste, we would buy this shirt.

The prefix هم means together or same. When added to the noun سلیقه (taste), it creates the compound word هم‌سلیقه, meaning having the same taste. You will see هم used frequently to show a shared trait or mutuality, like in همکار (coworker) or هم‌کلاسی (classmate).

Why is می‌خریدیم (we were buying) used here to mean we would buy?

In Farsi, hypothetical or unreal conditions use the past continuous tense for the result clause. While می‌خریدیم normally means we were buying or we used to buy, inside a hypothetical اگر (if) sentence like this, it functions as the English conditional we would buy.

Why does the if-clause use the simple past بودیم instead of the subjunctive?

This sentence is an unreal present conditional, meaning it imagines a situation that is not currently true. To express this in Farsi, the اگر clause takes the simple past tense. This mirrors English, which also uses the past tense for unreal presents, as in: If we had the same taste...

Why is the object marker را placed after این پیراهن instead of just پیراهن?

The word را marks a specific direct object. In this sentence, the object is the entire phrase this shirt (این پیراهن). The marker را must always go at the very end of the complete noun phrase it applies to, not in the middle of it.