PAST SIMPLE: Last Christmas...

I ate a lot of shellfish.
(comí mucho marisco)

PAST CONTINUOUS: Last Christmas...

Here I was opening the Christmas presents with my cousins.
(Aquí yo estaba abriendo los regalos de navidad con mis primos)

WHAT ARE YOU DOING THESE CHRISTMAS HOLIDAYS ?

I am eating with my family in Christmas.

(Yo voy a comer con mi familia en navidad)

I am having the twelve grapes with my friends on New Year's Eve.

(yo voy a tomar las 12 uvas con mis amigos el día de nochevieja)

These Christmas I am staying in Javea with all my family.

(estas navidades yo voy a quedarme en Javea con toda mi familia)