Learn Farsi: هم‌کلاسی‌های من در کتابخانه درس می‌خوانند. - My classmates are studying in the library.

It uses the associative prefix ham-, which means "co-" or "sharing the same," attached to kelâs (class). But notice the suffix -i at the end: ham- + kelâs + -i. The -i suffix turns the concept into a noun for a person who belongs to that shared space. So, a hamkelâsi is literally "a person of the same class."

Why is there a visible break between 'ham' and 'kelâsi' in the Farsi text (هم‌کلاسی)?

In modern written Farsi, prefixes like ham- (and verb prefixes like mi-) are usually separated from the main word by a "half-space" (a zero-width non-joiner). This prevents the letters from physically attaching to each other, making compound words easier to read than if they were connected as a single block.

Why is there an extra '-ye' sound connecting the plural to the pronoun in hamkelâsi-hâ-ye man?

The plural suffix -hâ ends in the vowel â. When you connect a word ending in a vowel to its possessor using the ezâfe (the grammatical "of" connector), you must add a y sound to bridge the vowels. So, instead of just adding the standard -e sound, it becomes -ye: hamkelâsi-hâ-ye man (classmates of mine).

Why is the compound verb 'dars mixânand' used here instead of just 'mixânand'?

While the simple verb xândan means "to read" or "to sing," the compound verb (literally "to read a lesson") specifically means "to study." If the sentence just used , it would mean "they are reading (a book)" rather than actively studying academic material.