The requirements to become an English teacher vary according to the type of teaching you want to do, as it is not the same to want to teach English in a state school as in a private or private school. If you want to be a teacher in a state school, you will have to take a competitive examination. The most popular training is usually a teaching degree or a degree in English with a master's degree in teacher training. If you want to give private tuition in English, on the other hand, you do not need any formal training or qualifications.