Learn Farsi: دوستم که کتابش درباره‌ی اروپا است، به یکی از توریستی‌ترین شهرهای آن دعوتم کرد. - My friend, whose book is about Europe, invited me to one of its most touristic cities.

دوستم که کتابش درباره‌ی اروپا است، به یکی از توریستی‌ترین شهرهای آن دعوتم کرد.doostam ke ketâbash darbâre-ye oroopâ ast, be yeki az touristi-tarin shahrhâ-ye ân da'vatam kard.

My friend, whose book is about Europe, invited me to one of its most touristic cities.

Breakdown of دوستم که کتابش درباره‌ی اروپا است، به یکی از توریستی‌ترین شهرهای آن دعوتم کرد.

Questions & Answers about دوستم که کتابش درباره‌ی اروپا است، به یکی از توریستی‌ترین شهرهای آن دعوتم کرد.

How do you form "one of its most touristic cities" in this sentence?

This uses the pattern you are currently learning: یکی از (one of) + superlative adjective (توریستی‌ترین) + plural noun (شهرها). Notice that the superlative adjective comes before the noun, unlike normal adjectives in Farsi. Finally, an ezāfe connects the plural noun to the pronoun آن (it/Europe), giving us یکی از توریستی‌ترین شهرهای آن.

I see که, but where is the word for "whose" in که کتابش?

Farsi doesn't have a direct equivalent for the relative pronoun "whose". Instead, it uses the general connector که (which/that/who) and adds a possessive suffix later in the clause. Here, کتابش means "his/her book". So, دوستم که کتابش literally translates to "my friend that his/her book...".

Why is the word for "me" attached to the word for "invitation" in دعوتم کرد?

In Farsi, direct objects are frequently expressed using pronoun clitics (like ـَم for "me"). With compound verbs like دعوت کردن (to invite), this clitic is usually attached to the non-verbal part of the verb. So, دعوت (invitation) + ـَم (me) + کرد (did) becomes دعوتم کرد (invited me). You could also say مرا دعوت کرد, but attaching the clitic is very natural and common at this level.

Why use آن (that/it) at the end of the sentence instead of a possessive suffix?