Farsi · Pronunciation Guide
mo-ta-as-SEH-fam, with a distinct little catch-in-the-throat between 'ta' and 'as' (that's the hamza), and the stress landing just before the ending.
mota'assefam
The base adjective motassef is stressed on its own final syllable; attaching the unstressed enclitic -am keeps that same stress point, which resurfaces as the 'se' syllable right before '-fam'.
Listen: متأسفم
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متأسفم، دیر کردم.
Mota'assefam, dir kardam.
I'm sorry, I'm late.
Listen: متأسفم، دیر کردم.
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'متأسفم، دیر کردم' uses another light-verb construction, دیر کردن ('to be late', literally 'to do late'), paralleling کمک کردن from earlier examples — Persian leans heavily on noun/adjective + کردن combinations instead of single verbs.
English speakers tend to smooth over the glottal stop entirely, running the word together as 'mo-tas-se-fam'; Iranians keep that small throat-catch clearly audible between 'ta' and 'assef'.