Diphthongs + Hiatus

Diptongos e hiato
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Diptongos e hiato

When a Spanish word has two vowels side by side, various pronunciation issues come into play: syllable division, diphthongs, and hiatus.

In terms of syllable division, Spanish vowels are divided into two categories:

  1. Strong vowels:  A, E, O
  2. Weak vowels:  I, U

To pronounce Spanish correctly, you need to understand strong and weak vowels and how they affect pronunciation.

1) Two strong vowels

Pronounced as a hiatus* with normal rules of word stress:


2) Strong vowel + weak vowel

Pronounced as a diphthong* with emphasis on the strong vowel. This is the most common combination.


3) Two weak vowels

Pronounced as a diphthong with emphasis on the second vowel



When the pronunciation of a word does not follow these rules, an acute accent is placed on the stressed vowel.


 * Notes

Hiatus: Two vowels pronounced as two distinct syllables.

Diphthong: Two vowels pronounced as a single syllable. When this happens, the unstressed weak vowel has a special sound: the letter I sounds like Y (as in yet) and U sounds like W (as in will).

 When the letter U’s purpose in a word is to make a consonant hard rather than soft, as in portugués and guisantes, it does not count as a vowel and thus the above rules do not apply.

Please note that this lesson is only a guideline for the Spanish that I know, which is Castilian Spanish. There are many regional variations in Spanish pronunciation.

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Spanish diphthongs and hiatus

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