Farsi · Pronunciation Guide
Say bee-ROON raf-TAN — birun stresses its second syllable like a normal noun, and raftan carries its own final-syllable stress too.
birun raftan
بیرون (birun) follows the regular noun/adverb pattern of final-syllable stress; raftan then stresses its own final syllable when bare, or its mi- prefix when conjugated.
Listen: بیرون رفتن
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او از خانه بیرون رفت.
U az khāne birun raft.
He/She went out of the house.
Listen: او از خانه بیرون رفت.
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'او از خانه بیرون رفت' (u az khāne birun raft, 'He/she left the house') uses از (az, 'from/out of') to mark خانه (khāne, 'the house') as the place exited, rather than an object marker — birun raftan literally means 'to go outside'. Raft is the bare simple-past stem, its only syllable naturally stressed.
Learners sometimes reach for را instead of از with the place being left, wrongly saying 'khāne rā birun raft'; the correct preposition here is از, since you're going 'out of' or 'from' the house, not taking the house as a direct object.