Verb conjugation of "servir" in Spanish

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.
Vocabulix includes a vocabulary builder for many languages, Spanish and German are just the ones that have the predefined sections. Generally speaking you can invent your own set of expressions and drill them on the speed train.
First of all I like to visit different places - but I like national parks, beautiful landscapes and unspoilt places in any country. Pure nature. We live in Dusseldorf - in the north of Germany.