It is not about if we are talking about people or not. i am not calm:sakin değilim you are not calm:sakin değilsin/sakin değilsiniz he/she/it is not calm:sakin değil we are not calm:sakin değiliz they are not calm:sakin değiller
Third singular person's conjugation is done that way. If you don't any adding after adding tense markers you get third singular person.
ye(stem)-r(present simple tense marker)-Ø (personal ending) al(stem)-ır(present simple tense marker)-Ø (personal ending) değil(stem)-Ø (present simple tense)-Ø (personal ending)
note: personal ending marker is used to show the agent,initiator of the event,doer.
First it would be "değildirler" :) Vowel harmony is important! Also, the suffix -dir within that isn't necessary and would sound quite weird, since it is mostly used for statements of facts.
Now, if you have a plural subject stated, there is no need to put the plural suffix anywhere else in the sentence. For example, "Onlar gidiyor," "Onlar digiyorlar," and "Gidiyorlar" all mean the same thing. You cannot just say "Gidiyor" though because that will be interpreted as singular :)
Hi everyone! quick question about "sakin": is there many other words where the vowels "a" and "i" are both present, in the same word? I was beginning to think that even within a word, the vowel harmony applies, same as when we add suffixes (in which case you won't have a suffix ending in "i" when the last vowel is "a")... ? am I just completely confused or is this "sakin" word some sort of exception ? thanks !