Spanish · Pronunciation Guide
yoh, one syllable — the y is a consonant here, like the y in "yes", and the o does not glide.
A single syllable, so there is nothing for the rule to act on — the whole word is the beat. As a subject pronoun it also carries phrase-level weight, since Spanish drops subject pronouns unless it wants to emphasize them.
Listen: yo
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Yo soy Ana.
I am Ana.
Listen: Yo soy Ana.
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"Yo soy Ana" is technically redundant — "soy" already means "I am", so the "yo" is there for contrast or emphasis, like the English "I'm Ana" said with a little push on the I. Notice how "yo" and "soy" bookend an /o/ sound; keep both of them tight and unglided and the sentence stops sounding English.
English-speaking beginners often read this as the exclamation "yo!" and land on a long, drifting "yoh-oo". The Spanish vowel is shorter and stays put. The second habit worth breaking early is using "yo" in every sentence the way English needs "I" — Spanish verb endings already carry the person, so a wall of "yo" in every clause sounds oddly insistent to a native ear.