Learn Farsi: مراکز تجاری باید قوانین جدید را رعایت کنند. - The commercial centers must obey the new laws.

The words are marâkez (centers) and qavânin (laws). They are the Arabic broken plurals for markaz (center) and qânun (law). While you could theoretically use standard Farsi endings like markaz-hâ or qânun-hâ, these Arabic patterns are extremely common in everyday Farsi and effectively act as the standard plurals.

"Commercial centers" are inanimate objects. Shouldn't the verb be in the singular form (konad) instead of the plural (konand)?

Usually, inanimate plural subjects do take a singular verb in Farsi. However, when an inanimate subject actually represents a group of people making decisions (like an organization, a company, or a commercial center), Farsi often treats it as a human subject and uses a plural verb. This reflects that the actual people running the centers must obey the laws.

Why is the object marker râ placed after jadid (new) instead of directly after qavânin (laws)?

In Farsi, the direct object marker râ must attach to the very end of the entire noun phrase. The direct object here isn't just the laws, it's the whole phrase "the new laws" (qavânin-e jadid). Therefore, râ waits until the adjective is finished before appearing.

The word bâyad (must) requires the following verb to be in the subjunctive form. Why isn't there a be- prefix on re'âyat konand?