Answer: Only 3 and 6 have P. The others don't because they are personally referring to one's self (personal) or they are referring to interactions.
Translations:
1. I saw a video.
2. I write a letter or paper.
3. They visited his/her/their family (People are mentioned in this one such as family). {P}
4. We ate a pizza.
5. You bought a tie.
6. We are looking for our dog (Pets are mentioned in this one because there is a dog). {P}
I hope this helped as I'm not very fluent in Spanish!
