The partitive article indicates an indefinite part taken from a whole. In our text we look "dei, delle, degli": these are the plural forms of the partitive article. You could use these like plural form of the indefinite article.
It's very important to remember the meaning of this kind of article. We look every form of the partitive article, singular and plural, feminine and masculine.
The first form is "DELLA". It's feminine singular.
Puoi comprare della Coca Cola? Could you buy some Cokes?
I don't say how many Coke I want. My request is indefinite. You could buy one, two, five, ten Coke.
This form becomes "DELL'" , when the word starts with a vowel.
Puoi comprare dell'acqua? Could you buy some water?
The second form is "DELLO". It's masculine singular. You use this form with the masculine words that start with these consonants "S + other consonants (studente, scoglio...), PS, GN, X, Y, Z, PN".
Puoi darmi dello zucchero? Could you give me some sugar?
This form becomes DELL'", when the word starts with a vowel.
Puoi cercare dell'olio? Could you look for some oil?
The third form is "DEL" It's masculine singular. You use this form with all other masculine words.
Lorenzo mangia del pane. Lorenzo eats some bread.
The first form is "DELLE". It's feminine plural.
Puoi comprare delle patate? Could you buy some potatoes?
The second form is "DEGLI". It's masculine plural. You
use this form with the masculine words that start with these consonants
"S + other consonants (studente, scoglio...), PS, GN, X, Y, Z, PN" or with a vowel.
Puoi darmi degli abiti puliti? Could you give me clean dresses?
The third form is "DEI" It's masculine plural. You use this form with all other masculine words.
Lorenzo mangia dei biscotti. Lorenzo eats some biscuits.
We translate the text: On my desk in office there are architecture books and Peter's ticket with an order "Archive!". We have some archives on the ground floor. I took the books and I moved them on chairs in the hallway. Archiving isn't of the obligations that I have. Peter arrived in the afternoon and was furious. I replied that I am not one of his interns, and that he has to stop being arrogant and boor. He insulted me again, but his books have remained in the hallway.