Translation of ermahnen

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.
I've been working on and off on the dictionary during the entire week, and I'll spend some more hours on it this coming weekend. Sometimes he would get a bit mixed up and use formal Castilian sometimes instead of informal.
So you are getting used to write in Spanish. But I think you should not worry, as your Spanish is good and you understand everything. You'll enjoy it a lot, once you meet new people who speak it.