what about words that start with "hie-"? The o changes into u or not?
Está hecha de madera o/u hierro?
words starting with -hie aren't changed if preceded by the conjunction "o". This change to "u" only affects nouns starting with -o or -ho.
Words that start with hie- are not even affected by the change y to e (see lesson at the bottom) because the sound of "hie" is more of a "ye" sound, therefore we can write:
Quiero agua y hielo.
Está hecha de madera y hierro.
See how conjunction y changes to e
I hope this helped.
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