This is the 9960th most frequent Turkish word.
ağaçlardır
"They are trees."
Here, 'ağaçlardır' is used as the predicate of the sentence, describing what the subject 'büyük bitkiler' are in the context.
Bahçede gördüğüm büyük bitkiler ağaçlardır.
The large plants I saw in the garden are trees.
In this case, 'ağaçlardır' defines the subject 'şey' related to park beauty, emphasizing what contributes to it.
Bu parkın güzelliğini oluşturan şey ağaçlardır.
What constitutes the beauty of this park are the trees.
Here, 'ağaçlardır' attributes a characteristic to 'sihirli olan varlıklar,' marking them as trees within the storytelling context.