Knutschi, I think Helmine has in mind that Americans, even if they would never be able to explain what the difference between past and present perfect is, might feel that there is something wrong or even misunderstand: I had a new boss (he is already gone) or I have got a new one (he is still there).
I just discovered this new forum. I didn't notice it before. I hope I will find the time to join you often, I could need some practice. From next week on, we will have an Englisch teacher who will come once a week for one and a half hours and practice English with me and my colleagues. We write quite a few emails, but we don't have much opportunity to speak. We are looking forward to it.
By the way: do some of you read English books? For me this is a good way to freshen up vocabulary.
I keep fit with reading English books. Preferably Stephen King or Anne Rice novels. News on Sky or CNN - and just like Knutschi DVDs of series switched to English.