Spanish · Pronunciation Guide
ah-YEE — the double l is a y sound and the accent puts the stress at the end.
Two syllables, a-LLÍ, and the accent is doing real work — the word ends in a vowel, so the default would give "A-lli". The mark moves the beat to the end. Its cousin "allá" needs an accent for the same reason, and both are distinguished from "aquí" mainly by distance: aquí is here, allí is there, allá is further still.
Listen: allí
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La tienda está allí.
The store is over there.
Listen: La tienda está allí.
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"La tienda está allí" uses estar for location. "Tienda" packs ie into one beat, TYEN-da, with a soft d between vowels. Say "está allí" and the final á merges with the opening a of "allí" into one longer vowel — es-TA-YEE — which is exactly how a native speaker would run it.
An English l for the ll produces "al-EE", which is not how any Spanish speaker says this word. It is a y sound throughout Latin America. The accent then gets ignored, giving "AH-yee" with a front beat. And the opening a wants reducing to a schwa, which flattens the word's whole shape — keep it wide open even though it is quick.