It's an old question that I have brought since I started to study English
Why do we have to use capital letter when we write the pronoun "I"?
Are there other cases that we have to use capital letter?
Exemple: My friend and "I" went to the Theater
"I" liked it so much but "he" didn't
See if this article helps you out: http://www.nytimes.com/2008/08/03/ma...tsafire-t.html
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.