Verb conjugation of "retreat" in English

After testing the audio lab at the University of Bern, other universities such as the one in Zurich, ore the one in Geneva have shown interest. Of course, all this takes time. I will let you know.
The conjugations of verbs are the biggest problem for me. I have never studied Spanish in school, but visited evening classes instead. This year I want to take a full Spanish course.
In school, we now are learning the grammar part, more specifically, the participles and so on. I understand it at all, but the conjugations, boy they are tough. A lot of patience is needed.