In Persian grammar, the indefinite article is used to express an indefinite person, place or thing. It’s comparable to the English “a”, “an”, or “some”. There isn’t a specific word for the indefinite article in Persian. Instead, it’s expressed either by the ending “-i” attached to the noun or by placing the words “yek” (one) or “chehel” (some) before the noun. This usage can seem tricky to learn for non-native speakers, so designed exercises will help students to grasp this important aspect of Persian grammar.