Translation of Auswechselspieler

I want to improve my level of English. Have you ever been in the U.S. and in which states have you been? I've been in England, Scotland and Ireland, but unfortunately, I have never been to America.
Everything's fine over here. The weather is a bit crazy, but otherwise everything is ok. I wrote this one based on what you gave me previously. This is a very common form of saying it in Spanish outside Argentina.
I am in my German lesson and I'm learning about the subjunctive. I had never heard about it before. Can you ever deal with all Verb conjugations? I just totally misunderstand the past tense!