Translation of retractarse

Some idiot copied it from there and inserted it into our vocabulary builder. He is allowed to do it as long as he indicates that sentences where taken from another source and are for self usage only.
Until now I have tried the copy the mode of operation of Mike in class. Even the homework that they gave us do not match the exercise that we tried yesterday. I could not fulfill this task anyway.
Of course I understand the reasons. I live in Thun, which is not far from Bern, our capital city. How come your Spanish is so good? Have you ever been to Switzerland. You are most welcome.