actually both works

Past Progressive, narrative

ben   geliyordum
sen   geliyordun
o     geliyordu
biz   geliyorduk
siz   geliyordunuz
onlar geliyordular; geliyorlardı

Örnek: Bir güzelin hayranı i-di-m>hayranıydım, hayranı idik>hayranıydık
Zeki idi>zekiydi
Ali imiş>Ali’ymiş,
Hasta ise>hastaysa,
Nöbetçi iken>nöbetçiyken,
Merhametli imişler>merhametliymişler
Merhametliler imiş>merhametlilermiş

Yeah it looks like both of them work but why only for third person plural? Only a misuse of suffix can explain it. This misuse became common in time I guess.

Ohhhh Allaha şükkür, my faith in my professor is restored! Thaaank you

Come on it is still a mistake

I think the reason is that in most Turkic accents in the past, personal suffixes came before ekfiil. But in Ottoman it always came after. So I think its a matter of accent.

But according to todays rules it should come final. So the professor and me are indeed wrong

Well I am doing it his way on my exam

Well my professor is seen as a big genius, so you can always contact him on youtube and let him know he is wrong I am not saying it.

I would certainly fail you

Well my professor is seen as a big genius, so you can always contact him on youtube and let him know he is wrong I am not saying it.

There is a saying in Turkish " who knows a lot is also mistaken a lot"

Whats his youtube?