I'm a Buisness English Teacher at a small private school located in Dijon, France and it is with great interest that I'm replying to your message. I think that you should use the eclectic approach i.e. a mixture of all the different methods.
Grammar is just as important as vocabulary. so don't try some odd approach but try and structure your course and always try and answer you learners demands in terms of progress and motivation.
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