Verb conjugation of "mangeln" 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.
There are many mountains and lakes in our district in the central Switzerland. I'm married and we have a son named Joe, he is 2 years old. I have worked as an engineer at the Swiss Federal Railways.
My Spanish is weak, and I need to improve it here. But it is very difficult because I have many other things to do. I must take care of my family and my friends and have no time for Spanish.