Answer:
alguien
Explanation:
¿conoces a alguien de puerto rico? means do you know anyone from pueto rico. when you put alguien in this sentance it means No, I don't know someone from Puerto Rico.
Same way you say it in English really. That's what my old Spanish teacher taught me, but if you have a letter that has a different pronunciation than you';; pronounce it different. Like Rebecca roll your R.
Answer:
The sentence in general is correct.
Explanation:
If you would like to add a name in the blank, for example, Mi amigo Fernando es de Venezuela, then you could do that. But otherwise, it is perfect!