You have a lot of flexibility with the words ayer and hoy.
Fue ayer. It was yesterday/ It happened yesterday.
Ayer fue el primer día que ....... Yesterday was the first day that .....
Ayer fue a la tienda. She went to the store yesterday.
All three positions sound ok to me-- at the beginning or end of the sentence, or right after the main verb. Just like Marsopa said.
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