you ate tuna sandwitches

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if the action of eating the tuna sandwiches is over after 1 time, then you use the preterite tense; comiste. but, if you want to say that "you ate tuna sandwiches" often as a child. this is a repeating action and then the imperfect is used; comias.

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Comiste sandwiches de atún

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If the sentence is referring as "you used to" like "You used to eat tuna sandwiches" then the translation would be: "Tú solías comer emparedados de atún."

If you are expressing the action of the sentence just in past then it would be: "Comiste emparedados de atún."

Previous answers are wrong because none of them actually provided a proper translation, all of them mentioned "sandwiches" as if it were a Spanish word but "sandwich" does haves a translation like every word does. Hope this helps, any further help please keep posting questions or feel free to contact me.

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Tu comio sandwitches de atun