Although Turkish & Persian belong to different language groups - Persian (Iranic) and Turkish (Turkic), they have coexisted in Central & West Asia for roughly the last 2,000 years. As a result, beyond vocabulary, the two languages can sometimes display surprisingly similar grammatical structures.
Both languages are genderless systems, so a third-person pronoun can refer to “he,” “she,” or “it.”
Turkish uses O, while Persian uses U (formal) and UN (informal). The similarity becomes especially striking in third-person object and possessive marking.
English: I saw him/her/it yesterday.
Turkish: Dün onu gördüm.
Persian: Diruz uno didam.
Turkish
dün = yesterday
o = he/she/it
-n- = buffer consonant
-u = accusative marker
onu = him/her/it
gör-dü-m = see-PST-1SG → “I saw”
Persian
diruz = yesterday
un = he/she/it
-o = accusative marker
uno = him/her/it
di-d-am = see-PST-1SG → “I saw”
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The parallel becomes even more interesting with third-person possessives. Both languages use an s/sh-type consonant in the third-person possessive form.
English: I didn't drive his/her car.
Turkish: Ben arabasını sürmedim.
Persian: Man mashinesho ranandegi nakardam.
Turkish
ben = I
araba = car
-sı = 3rd-person possessive → “his/her/its”
-n- = buffer consonant
-ı = accusative marker
arabasını = his/her car
sür-me-di-m = drive-NEG-PST-1SG → “I didn't drive”
Persian
man = I
mashin = car
-e = linking vowel
-sh = 3rd-person possessive → “his/her/its”
-o = accusative marker
mashinesho = his/her car
ranandegi na-kar-d-am = drive NEG-do-PST-1SG → “I didn't drive”
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Third-person object
Turkish: o → onu
Persian: un → uno
Third-person possessive
Turkish: araba + sı + nı → arabasını
Persian: mashine + sh + o → mashinesho