"His shoes are green."
You definitely need an analytical mind to learn this language. I was confused too!
the shoes = Ayakkabılar
Edit: Wait, did you think the "ı" was accusative, marking the "the"? It's not accusative. It can't be an accusative, because it's the subject of the sentence. There is no way to indicate the "the" when a word is the subject of the sentence. Therefore that "ı" must be something else. And indeed, there is another suffix that is also just "ı": 3rd person possessive:
Benim ayakkabılarım; Senin ayakkabıların; Onun ayakkabıları.
PS. In accusative, it would be: Onun ayakkabılarını, but this is impossible for this sentence. You can only do that when it's the object.