Spanish · Pronunciation Guide
sehr, one syllable — a hissing s, the vowel of "bed", and a single tapped r.
Stress is trivial in a word this short — but the conjugation is one of the most irregular in the language, and every form has to be memorized with its own rhythm: "soy", "eres", "es", "somos", "son", and the past "fui" and "fue" borrowed wholesale from a different verb entirely. None of them looks like the infinitive.
Listen: ser
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Quiero ser profesor.
I want to be a teacher.
Listen: Quiero ser profesor.
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"Quiero ser profesor" uses ser because a profession is treated as identity, and Spanish drops the article that English requires — you say I want to be teacher, not a teacher. "Profesor" is stressed on the final syllable because it ends in r, so pro-fe-SOR, and the two o's in it stay rounded and full.
English speakers say "sair" or "sur", both of which bend the vowel into the r. Keep the "eh" clean and finish with one light tap. The word is short enough that the real difficulty lies elsewhere: choosing between ser and estar. The rough rule is that ser answers what something is and estar answers how or where it is, but the edges take a long time to learn by feel.