"I was at the supermarket" would be "Yo estaba/estuve en el supermercado." (from "estar")
"I went to the supermarket" would be "Yo iba/fui al supermercado." (from "ir")
Bear in mind that we can use both the Imperfecto (estaba) or the Indefinido (estuve) in the first sentence, as well as in the second sentence we could use the Imperfecto (iba) or the Indefinido (fui).
I hope it helped. Inma
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