آنها هنوز کاشی‌های بزرگ‌ترین اتاق را نصب نکرده‌اند.

Breakdown of آنها هنوز کاشی‌های بزرگ‌ترین اتاق را نصب نکرده‌اند.

آنها
they
اتاق
room
بزرگbozorg
big / large
را
definite direct object marker
هنوزhanuz
yet / still
کاشیkâshi
tile
نصب کردنnasb kardan
to install

Questions & Answers about آنها هنوز کاشی‌های بزرگ‌ترین اتاق را نصب نکرده‌اند.

How do we form the negative present perfect in نصب نکرده‌اند?
It is a compound verb. We take the negative prefix na- and attach it to the past participle of کردن, which is کرده. Then we add the short "to be" verb for "they", which is اند. This gives us نصب نکرده‌اند (they have not installed).
Why is the direct object marker را placed after اتاق instead of right after the word for tiles?
The direct object here is the entire phrase "the tiles of the biggest room" (کاشی‌های بزرگ‌ترین اتاق). The word را always goes at the very end of the complete direct object phrase, not just after the first noun.
I know adjectives usually come after nouns in Farsi. Why does بزرگ‌ترین come before اتاق?
بزرگ‌ترین means "biggest". While normal adjectives follow the noun, superlative adjectives (the ones ending in -tarین, meaning "the most" or "-est") are an exception and always come right before the noun they describe.
Where does هنوز (yet) go in a Farsi sentence compared to English?
While "yet" usually goes at the very end of a sentence in English, هنوز generally comes early in a Farsi sentence. Here, it is placed right after the subject آنها (they).

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