Now this is the major change that I've seen -- how teaching English has morphed from being a mutually beneficial practice to becoming a massive international business that it is today. No longer just a foreign language on the school curriculum, and no longer the sole domain of mother England, it has become a bandwagon for every English-speaking nation on earth. And why not? After all, the best education -- according to the latest World University Rankings -- is to be found in the universities of the U.K. and the U.S. So everybody wants to have an English education, naturally. But if you're not a native speaker, you have to pass a test.