Verb conjugation of "knarren" in German

After next week, I will tutor the Mr. Zillmay from the language lab in Los Angeles, he is currently in the states. The lesson will take place in LA, but it may be held no earlier than mid-February.
I have not installed ICQ, unfortunately, but I know many people who use other means of communication, perhaps I can down load it! Currently I am unemployed, I have worked as a waitress.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.