Postposition râ (Accusative case)
The postposition râ marks the accusative case which expresses direct object. Since it's a postposition, it comes after the noun which is going to play the role of a direct object.
|barâdar-ash râ didam||I saw his brother|
|ketâb-ash râ didam||I saw his book|
|kif-am râ gom kardeam||I've lost my bag|
|Mâshin-ash râ shost||She washed her car|
|chiz-i râ az Engelisi be Fârsi tarjome kardan||to translate something from English into Persian|