Learn Farsi: پل خزه‌بسته خیلی قدیمی و زیبا است. - The moss-covered bridge is very old and beautiful.

It perfectly demonstrates the 'Noun + bare Past Participle' structure. It combines the noun خزه (moss) with بسته (the bare past participle of بستن, meaning tied, bound, or closed). Together, they form a new adjective describing the resulting state of the bridge: 'moss-bound' or 'moss-covered'.

Why use the participle بسته instead of a literal word for 'covered'?

In Farsi, the verb بستن (to tie or close) is often used idiomatically for substances that form, accumulate, or set over a surface. You will see this same bare past participle in other resulting-state adjectives like یخ‌بسته (frozen or ice-bound) and زنگ‌بسته (rusted).

Is there an Ezafe pronounced between پل and خزه‌بسته?

Yes, it is pronounced as پلِ خزه‌بسته (pol-e khaze-baste). Because the compound word خزه‌بسته functions as a single adjective describing the noun پل (bridge), they must be linked by the standard Ezafe vowel.

Why is there a small gap but no full space between خزه and بسته?

That is a half-space. In modern Farsi orthography, it is used to visually separate the distinct parts of a compound word. It reminds the reader that خزه and بسته are combined into one grammatical unit rather than acting as two separate words.