Verb conjugation of "sündigen" 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 grew up in Angola, but now I'm in Hanover, not far from your border town. I used to study at the university in Boston, Massachusetts. I have graduated from MIT, which is the technology institute.
I attended a Spanish course in Malaga, but I need more practice and speak more often (and write of course). Here in Germany it is a bit difficult to learn Spanish because we do not have the chance to practice.