Many native Spanish speakers have trouble determining when accent marks (tildes) should be used and where. What are the rules for accent placement in Spanish? How do you determine whether the vowel on the accented syllable should have an accent mark or not?
There are three main categories of words in Spanish, according to what syllable the stress falls on: agudas, llanas o graves and esdrújulas. Let's see what these terms mean.
Words are divided in syllables. In order to know what syllable gets the tilde, you need to count the syllables. The counting starts from the last syllable towards the beginning of the word:
Note: the examples were taken from the Italian Wikipedia page.