Verb conjugation of "demonstrieren" in German

Yes, I speak a little bit of English. I'm just beginning to take English courses in private evening classes. Is your Spanish good? I will speak to you in Spanish and you teach me in English.
Sometimes I visit Vocabulix to meet new people. It is true that one could do the same on Facebook, but the FB page is rather for friends, and you are less likely to contact strangers for this purpose.
My problem never was the writing part, but I did not have the courage to speak. When I did not get further, I had to use my hands and feet to communicate, which always seems a little stupid.