Spanish · Pronunciation Guide
AHL-toh, stress on the first syllable, with a wide "ah" and a bright l.
Two syllables: AL-to, stressed on the first, as the rule for this ending requires. All four forms keep it. Worth knowing that "alto" also appears as a road sign meaning stop in much of Latin America, and as a musical voice part — same spelling, same stress, three different jobs.
Listen: alto
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Ese edificio es muy alto.
That building is very tall.
Listen: Ese edificio es muy alto.
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"Ese edificio es muy alto" uses ser because height is an inherent property. "Edificio" is four beats, e-di-FI-cio, with a soft c before i and the io fusing into one final syllable. Say "muy alto" and the y glide runs straight into the a, giving mwee-AL-to with no break.
The l is the giveaway: English speakers pull the tongue back before the t and produce a dark "AHW-toh", swallowing the consonant. Keep the tongue tip firmly behind the upper teeth. The opening vowel also gets flattened toward the English "alto" of music, which uses a different a. And the t must stay dry and dental rather than picking up an English puff.