Jorge celebraba su cumpleaños y recibía muchos regalos.
Here's why:
* Imperfect tense is used to describe ongoing actions or states in the past. It emphasizes the continuous nature of an action.
* Celebrar (to celebrate) and recibir (to receive) are regular verbs, so their imperfect forms are formed by adding -aba, -abas, -aba, -ábamos, -abais, -aban to the stem of the verb.
* In this case, we use the imperfect to emphasize that Jorge regularly celebrated his birthday and received many gifts in the past.
Let me know if you have any other questions!