It was 25th of november, my friend and me.

When talking about specific dates, we use 1st, 2nd, 3rd, 4th, 5th, etc. so it is unnatural to see dates without that.

WeMy friend and I were at the airport, o. Our airplane left sincewas going to Barcelona.

We use "since" in terms of time or when we are trying to convey a reason based on a previous experience. Saying "left for Barcelona" implies you are still on the flight since there is no conclusion to the action. Instead, saying "was going to Barcelona" implies the experience is over, but at the time was what was happening.

When we arrived us, my friend Federico was arrested, because him saved in his backpack a fake gun, bute had a fake gun in his backpack.

Use "we" as the subject of the sentence. For example, "we went to Barcelona". Subject is "we", object is Barcelona. We are doing the action. "Us" is used as an object pronoun. For example, "It taught us how to read". In this sentence, we are the subject. The subject is us.

Use "he", not "him" for the same reason. "He" is the subject pronoun, while "him" is the object pronoun.

But I talked with a police and I said, He's"he likes to make jokes" and he was released.

It was 25th of nNovember, my friend and me.I was with my best friend

We were at the airport, our airplane left sincefrom Barcelona.

When we arrived us, my friend Federico was arrested, because him saved in his backpack a fake gun, bute had a fake gun in his backpack.

But then, I talked with athe police and I said, He'sexplained that he likes to make jokes, and he was released.