Spanish has five pure, crisp vowel sounds. Once you learn them, you're set. English, however, is a different story. It has over a dozen vowel sounds, and the same letter can represent several different sounds. The key difference that often trips up Spanish speakers is the concept of vowel length: short vowels versus long vowels.

Long vowels in English often sound similar to the pure vowels in Spanish, but they are held for a slightly longer duration. Short vowels are quicker and often made with a more relaxed mouth and tongue. This small difference can completely change the meaning of a word. Take the sound for the letter 'i'. In Spanish, it's always a pure /i/ sound, like the 'ee' in the English word 'feet'.

Many English vowels come in these short/long pairs. Becoming familiar with them is a crucial step toward clearer pronunciation.

Another feature of English vowels is the diphthong. Unlike the pure vowels of Spanish, a diphthong is a single syllable where the sound glides from one vowel to another.

Think of the word "boy." Your mouth starts in the position for "oh" and glides to the position for "ee." You don't say two separate syllables, but rather one smooth, blended sound.

Perhaps the biggest secret to sounding more like a native English speaker is mastering the schwa. It's the most common vowel sound in English, yet it doesn't have its own letter. It’s a short, relaxed, neutral vowel sound that appears in unstressed syllables.

In Spanish, every vowel in a word is fully pronounced. For example, in "banana," all three 'a' sounds are clear. In English, we only stress the middle syllable: "ba-NA-na." The first and last 'a's are unstressed, so they become a weak, mumbled "uh" sound. That's the schwa.

Learning to use the schwa in unstressed syllables, instead of fully pronouncing each vowel, will dramatically improve the rhythm and flow of your English.

Mastering these new vowel sounds takes practice. Listen carefully to native speakers and try to imitate the short, long, and gliding sounds you hear.