I know this is not really a new question but . . .
I got a letter from John yesterday. We were at school but I lost touch with him because he was very ill and could not go to school anymore.
QUESTION #1: Here is my question. Will it be possible to use past simple for lost because if I receive a letter that means I am in touch again. So the action "lost" is completed or finished as soon as I get a letter. In that case, past perfect should be better. Right?
QUESTION #2: Same question for were at school. That means that I'm still at school with John at the time of receiving a letter. Right?