How to support healthy class competition in an English lesson

This article is about the role of competitions. Actually, learning English and competition seem to have nothing in common, but modern school students come to classes not only for knowledge and gaining skills, but also to show leadership qualities, compete as a completed homework, learn to express opinion and, in addition, prove right - in English. And often, if guru students gather in the group, who carefully prepare tasks or like to read additional literature, or maybe simply have strong leadership qualities, the teacher has to raise fighting opinions in different angles.