Cuando/ saber/ tu/ fecha/ de la graduacion

cuando yo [1. era] joven, yo siempre [2. visitaba] a mis abuelos en la costa oeste de puerto rico. mis abuelos [3. vivian] en una pequena casa que [4. estaba] enfrente de una de las playas mas bonitas en la isla. cada vez que yo [5. llegaba] mis abuelos [6. hacian] lo mismo: [7. preparaban] una comida grande y me [8. preguntaban] como las cosas me [9. iban] en la escuela. yo [10. fui] a su casa por siete veranos consecutivos, hasta que ellos [11. decidieron] mudarse a otra parte de la isla porque les [12. tenian] miedo a las olas que a veces [13. eran] un poco grandes.

hope this ! : )

ah, so ustedes and nosotros are my 'go-to' if i am using spanish mainly in the states? interesting, but still slightly confusing, haha."

it seems that you are a little confused about subject pronouns. yo=i, tú/usted=you, nosotros=we, ustedes=you(plural), ellos/ellas=they.

in the case of vosotros, it is an informal replacement for "ustedes" in spain. similar to using "you all" in english.

even though it is not generally used in conversation outside of spain, it is used many times in literature. i would suggest having at least some familiarity to that form, at least to recognize what it is.