Verb conjugation of "zwingen" in German

I work as an actor in the theater. I have studied English for seven years, French and Spanish for two years. Well, my level of Spanish is too low to have a good conversation, but I understand it.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
Life in Brazil is exciting because it is so different. The people, the weather, and so much more! One can have a completely wrong impression when listening to the media. You can live a great life here.