[poli]

I don't know if this helps, but there are very specific accent rules. Generally, if the accent of a word lands on the second to last syllable when a word ends with a consonant other than n or s, and no diacritical mark is needed. In cases, such as the word calidad, the accent lands on the last syllable unless the accent mark is used. Often in words borrowed from English, such as sandwich, the Spanish language must apply the accent mark in order to more closely conform to the pronunciation of the word in its original language.