ALL LEVELS OF SPANISH: ACCENT RULES

Select the word with accent or not according to the following rules: If the word ends in n,s, or vowel it doesn't need an accent if the natural stress falls on the next-to-the-last syllable.
If the word ends in anything else (than n,s,vowel) it doesn't need an accent if the natural stress falls on the last syllable.
Mark accents only when it breaks one of these rules, and then mark it where it is stressed.