This is the 378th most frequent Turkish word.
bunlar
"These."
The word 'bunlar' is used as the subject of the sentence meaning 'these' and refers to the pens.
Bunlar benim kalemlerim.
These are my pens.
Here, 'bunlar' identifies specific places being mentioned or referred to, serving as the subject.
Bunlar, şehir merkezinin önemli yerleridir.
These are the important places in the city center.
In this example, 'bunlar' refers to 'these' as a context-dependent group of books and is used within the prepositional phrase.