In my experience: book > unit > chapter > lesson > exercises. Eliminate what your book doesn't have.
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PhilipIn my experience: book > unit > chapter > lesson > exercises. Eliminate what your book doesn't have.That sounds good, but my experience has been that the words are used in the way that the author wishes them to be used. In the days when I was obliged to use certain coursebooks, one of the first things I checked was whether my learners used