This is the 2313th most frequent Turkish word.
değilim
"I am not."
The word 'değilim' is used to negate the predicate "tired" in the present tense, first person singular, in the sentence structure "Subject + Predicate + Negation."
Ben yorgun değilim.
I am not tired.
The word 'değilim' here describes the negation of the noun predicate "student" in the context of location, again in the first person singular.
Burada öğrenci değilim.
I am not a student here.
In this instance, 'değilim' negates the idiomatic phrase "aynı fikirde," meaning "in agreement." It follows the same grammatical rule as in other examples.